DP Biology Questionbank

Description

Overview of the essential ideas for this topic.

6.1: The structure of the wall of the small intestine allows it to move, digest and absorb food.

6.2: The blood system continuously transports substances to cells and simultaneously collects waste products.

6.3: The human body has structures and processes that resist the continuous threat of invasion by pathogens.

6.4: The lungs are actively ventilated to ensure that gas exchange can occur passively.

6.5: Neurons transmit the message, synapses modulate the message.

6.6:Hormones are used when signals need to be widely distributed.

Directly related questions

• 15M.1.HL.TZ1.23: Which describes the secretion of hormones in the pancreas in response to low levels of glucose in...
• 15M.2.SL.TZ2.4b: Explain antibody production.
• 15M.2.SL.TZ2.4c: Explain why antibiotics are effective against bacterial diseases but not against viral diseases.
• 15M.3.SL.TZ1.3b: Explain the dietary advice that should be given to a patient who has developed type II diabetes.
• 15M.1.SL.TZ1.29: What changes take place in the thorax during inhalation?
• 13M.3.HL.TZ2.13a: State the relationship between asthma and lung function.
• 13M.1.SL.TZ2.29: What structures are indicated on the diagram?
• 13M.3.SL.TZ2.4c (i): Compare the effects of the 3000 m programme with the 6000 m programme on muscle glycogen levels.
• 13M.3.SL.TZ1.4a: Calculate the difference in blood pressure at systole between rest and exercise before flight,...
• 13M.3.SL.TZ2.4b: State the effect of the 3000 m programme on glycogen levels in slow (type I) muscle fibres.
• 11M.2.HL.TZ2.8a: Outline the role of the skin in temperature regulation.
• 11M.1.SL.TZ1.25: Celiac disease causes the destruction of the villi cells. Which of the following is most likely...
• 11M.1.SL.TZ1.27: Which of the following statements about antibodies is correct? A. Antibodies are polypeptides. ...
• 11M.1.SL.TZ2.9: Which organs are associated with the transformation of glucose into glycogen? A. 1 and 4 B. 2...
• 11M.3.SL.TZ1.3c: Explain the dietary advice that should be given to a patient who has developed type II diabetes.
• 12M.1.HL.TZ1.22: What is a characteristic of axons in motor neurons? A. When there is a resting potential, the...
• 12M.1.SL.TZ2.30: What is a function of LH (luteinizing hormone)? A. It stimulates the release of an egg from the...
• 12M.2.SL.TZ1.7b: Describe how body temperature is maintained in humans.
• 09M.2.HL.TZ1.7b: Outline the principle of immunity.
• 09M.2.HL.TZ2.7a: Draw a labelled diagram of the heart showing the chambers, associated blood vessels and valves.
• 09M.1.HL.TZ1.19: Which of the following parts of the digestive system secrete proteases?
• 09M.2.SL.TZ1.5: Distinguish between type I and type II diabetes.
• 09M.1.SL.TZ1.28: On the diagram of the motor neurone shown below, which label identifies a dendrite?
• 09M.2.SL.TZ2.5c: Explain the mechanisms involved in the ventilation of the lungs.
• 09M.1.HL.TZ2.13: Which structure releases glucagon? A. α cells of the pancreasB. β cells of the pancreasC. Liver...
• 10M.1.SL.TZ2.24: Which feature increases the absorption of glucose in the small intestine? A. Villi B. Lacteal C....
• 10M.2.SL.TZ1.6b: Explain how the structure of an artery allows it to carry out its function efficiently.
• 10M.2.SL.TZ2.4b: Describe the need for a ventilation system in humans.
• 11N.2.HL.TZ0.1a (i): State the maximum number of stem cells per ml blood in the control mice.
• 11N.2.HL.TZ0.1c: Other studies suggest that a greater number of blood stem cells for transplantation may be...
• 11N.1.HL.TZ0.28: What is the role of the pacemaker (SAN)? A. It controls the release of epinephrine...
• 11N.2.SL.TZ0.2b (ii): Cells defend the body against pathogens. Outline how some of these cells ingest pathogens in the...
• 11N.2.SL.TZ0.7a: Distinguish between ventilation, gas exchange and cell respiration.
• 12N.2.HL.TZ0.1c: Phospholipids found in the surfactants form a surface film on the moist lining of the alveoli....
• 12N.2.HL.TZ0.1f: Using all the data provided, evaluate the hypothesis that the presence of proteins in surfactants...
• 12N.1.HL.TZ0.36: Formation of a blood clot by damaged tissue involves the series of steps outlined in the...
• 12N.1.SL.TZ0.7: Which element or ion is required for transmission of a nerve impulse? A. Phosphorous B. Sodium...
• 09N.2.SL.TZ0.4b: Outline the role of luteinizing hormone (LH) after ovulation.
• 10N.2.HL.TZ0.3c: Define the term pathogen.
• 09N.2.SL.TZ0.3d: Explain how the structure of the villus is adapted for absorption.
• 09N.2.SL.TZ0.6a: Draw a labelled diagram to show the human ventilation system.
• 09N.2.HL.TZ0.1g: Evaluate, using the data, whether exercise would be an appropriate therapy for human patients...
• 09N.2.HL.TZ0.5c: Explain how nerve impulses are transmitted along and between neurons.
• 10N.3.HL.TZ0.7d: Suggest how antibiotic-resistant bacteria are passed from animals to humans.
• 15N.1.SL.TZ0.30: When the left ventricle is relaxed, what is the state of the valves?
• 15N.2.SL.TZ0.2c: Outline the effectiveness of antibiotics against viruses and bacteria.
• 13N.1.HL.TZ0.20: What are features of the enzyme amylase?
• 13N.1.SL.TZ0.26: What is dissolved in blood plasma?A. carbon dioxide, erythrocytes and plateletsB. amino acids,...
• 13N.2.SL.TZ0.1g: Some investigators suggest that there is a strong relationship between high lipid diet and the...
• 13N.2.SL.TZ0.5c: Explain the mechanism of ventilation in humans.
• 13N.2.SL.TZ0.6c: Outline the role of hormones in the menstrual cycle.
• 13N.2.HL.TZ0.1i: Some investigators suggest that there is a strong relationship between high lipid diet and the...
• 13N.3.HL.TZ0.14b: Outline a mechanism used to transport products of digestion from the lumen of the ileum into the...
• 14N.1.SL.TZ0.25: Which vessel carries deoxygenated blood from the heart to the lungs?A. Vena cavaB. Coronary...
• 09N.1.HL.TZ0.20: The diagram below shows parts of the human digestive system. Which points are linked by the...
• 12N.1.SL.TZ0.26: Which statement describes the movements of the rib cage during inhalation of air? A. External...
• 16N.1.SL.TZ0.27: What is the purpose of pulmonary surfactant? A. Promotes capillary growthB. Decreases surface...
• 16M.2.HL.TZ0.1a: State the highest mean concentration of blood glucose in the mice with...
• 16M.2.HL.TZ0.1b: Outline the cause of type I diabetes in humans.
• 16M.2.HL.TZ0.3c: Resistance to neonicotinoid pesticides has been observed in some insects....
• 16M.2.HL.TZ0.1d: Compare and contrast the concentration of blood glucose resulting from the embryonic stem cell...
• 17M.1.SL.TZ1.25: Neurotransmitters are released into the synaptic cleft from the presynaptic neuron and travel to...
• 17M.1.SL.TZ1.28: The diagram shows the male reproductive organs in front view. Which structures are indicated...
• 17M.1.HL.TZ2.34: The graph shows the ventilation rate and the oxygen consumption of a subject before, during and...
• 17M.1.HL.TZ1.21: Glucose is absorbed through protein channels in the plasma membrane of epithelium cells in the...
• 17M.2.SL.TZ2.1a.ii: Outline the trends in capillary density in the results of this experiment.
• 17M.2.SL.TZ2.5c: Some blood proteins are involved in defence against infectious disease. Explain the roles of...
• 17M.2.SL.TZ2.1a.i: State the significance of the statement: p<0.05.
• 17N.1.SL.TZ0.27: What can protect the body from blood loss? A. Antibodies B. Fibrin C. Histamines D. Hemophilia
• 17N.2.SL.TZ0.01g: Other studies on pulmonary diseases have shown a wide variety of results. Apart from age, sex and...
• 17N.2.HL.TZ0.01f: Using all relevant data in the question, evaluate the effectiveness of the rats’ adaptation to...
• 17N.2.HL.TZ0.01e.i: Outline the effect of hypoxia on the force of contraction of the diaphragm.
• 17N.3.SL.TZ0.03b: Distinguish between the vein and the artery with reference to structures visible in the micrograph.
• 15M.1.SL.TZ2.24: What are functions of the stomach, small intestine and large intestine?
• 15M.2.SL.TZ2.4a: Define pathogen.
• 15M.2.HL.TZ2.6a: Draw a labelled diagram of the human heart showing the attached blood vessels.
• 13M.2.HL.TZ1.8c: Explain the mechanism of ventilation of human lungs.
• 13M.1.HL.TZ1.20: Which enzyme is amylase?  
• 13M.2.HL.TZ2.8b: Hormones such as FSH (follicle stimulating hormone) and LH (luteinizing hormone) affect the...
• 13M.1.HL.TZ2.22: Where are structures I, II and III found in the human body?  
• 13M.2.SL.TZ1.1b: Analyse the effect of increasing the ratio of rAChE to OP on the symptoms in mice.
• 13M.2.SL.TZ1.1f: Using the data from both graphs, evaluate the hypothesis that plant-produced rAChE could be used...
• 13M.2.SL.TZ2.5a: State the source, substrate, products and optimal pH condition for lipase in the human digestive...
• 13M.3.SL.TZ2.4d: Suggest one limitation of the data.
• 11M.1.HL.TZ1.21: Celiac disease causes the destruction of the villi cells. Which of the following is most likely...
• 11M.3.HL.TZ2.5b: Outline the unconscious control of the heart rate.
• 11M.1.SL.TZ1.29: Which words from the table below complete the sentence correctly? In the pancreas, _____I___...
• 11M.1.SL.TZ2.27: Which vessel directly supplies the heart muscle with blood? A. The aorta B. The pulmonary...
• 11M.3.SL.TZ1.6b: Explain the role of calcium ions in muscle contraction.
• 12M.2.HL.TZ1.3b: Explain how the direction of blood flow in the heart is controlled.
• 12M.1.HL.TZ1.35: Which reaction during blood clotting is catalysed by the enzyme thrombin? A. Soluble fibrin to...
• 12M.1.SL.TZ2.26: Which of the following are controlled by homeostasis? I. Blood pH II. Water balance III. Blood...
• 12M.2.SL.TZ1.7a: Outline what is meant by homeostasis.
• 12M.2.SL.TZ2.4a (iii): Blood transports molecules throughout the body. State where the blood absorbs oxygen.
• 09M.2.HL.TZ2.5a: Draw a labelled diagram of the adult female reproductive system.
• 09M.1.HL.TZ1.20: Why are antibiotics effective against bacteria but not viruses? A. Viruses can hide inside host...
• 09M.1.SL.TZ2.18: Which term describes a molecule capable of triggering an immune response? A. AntibodyB....
• 09M.1.SL.TZ2.16: Which event directly leads to an action potential? A. Fusion of vesicles with the pre-synaptic...
• 09M.1.SL.TZ2.29: What is placed into the uterus after the process of in vitro fertilization (IVF)? A. EggsB....
• 10M.2.HL.TZ2.6b: Describe how pancreatic cells directly affect blood glucose levels.
• 10M.2.HL.TZ2.2d (ii): List two roles of testosterone in males.
• 10M.1.SL.TZ1.27: What are two effects of HIV on the immune system? A. Reduction in antibody production and...
• 10M.1.SL.TZ1.29: What are causes of type I and type II diabetes?
• 10M.1.SL.TZ1.30: In the diagram of synaptic transmission below, what is indicated by the letters X and Y?
• 10M.2.SL.TZ1.7b: Plants store carbohydrate in the form of starch. Explain the reasons for starch being digested by...
• 10M.2.SL.TZ2.1d (i): Identify which ion the moths are retaining in their body from the laboratory solutions.
• 10M.2.SL.TZ2.1e: The diagram below shows the digestive system anatomy of the male and female moth. Using the...
• 11N.2.HL.TZ0.1 h: Research is being conducted into treatment for diabetes based on stem cells. Discuss the ethical...
• 11N.2.HL.TZ0.1d: Explain how the amount of mRNA for CXCL12 gives an indication of the amount of protein CXCL12...
• 11N.2.HL.TZ0.1 f (ii): Suggest how the breakdown of CXCL12 in the bone marrow may be related to diabetes.
• 11N.2.SL.TZ0.2a (i): Label the diagram to show the structure that is involved in digestion of proteins in acid...
• 11N.2.SL.TZ0.2b (i): Explain how the structure of veins is adapted to their function. 
• 11N.1.SL.TZ0.25: Between which structures do sensory neurons carry nerve impulses? A. From effectors to the...
• 12N.2.HL.TZ0.1a: State the surfactant that contains the least amount of phospholipids.
• 12N.1.HL.TZ0.21: What is a feature of type I diabetes but not type II diabetes? A. Target cells become...
• 12N.1.HL.TZ0.23: The diagram shows a section through the male reproductive system. Which structure represents the...
• 12N.2.SL.TZ0.7b: Outline the control of the heartbeat by the nervous and endocrine systems.    
• 10N.2.SL.TZ0.6c: Discuss the cause, transmission and social implications of AIDS.
• 10N.2.HL.TZ0.5c: Discuss the cause, transmission and social implications of AIDS.
• 09N.2.SL.TZ0.3c: State one function of the large intestine.
• 09N.2.SL.TZ0.6c: Explain the concept of homeostasis, using the control of blood sugar as an example.
• 09N.2.HL.TZ0.1c: Distinguish between the response of the two groups of mice to the injection of glucose.
• 09N.3.SL.TZ0.2b: Outline the reasons for increasing rates of clinical obesity in some countries.
• 15N.1.SL.TZ0.25: What causes heart ventricles to fill with blood? I. Atrial contraction II. Closing of...
• 15N.1.HL.TZ0.20: What structures in the small intestine transport most fats? A. Collecting ducts B....
• 15N.1.HL.TZ0.23: What happens first when a neurotransmitter binds to a postsynaptic neuron? A. Ions diffuse B....
• 13N.1.SL.TZ0.25: The diagram below shows the human heart. What structures are indicated by the labels X, Y and...
• 13N.1.HL.TZ0.25: Where is follicle stimulating hormone (FSH) produced in females and what is its function?A....
• 13N.2.SL.TZ0.1c: Calculate the percentage change of enzyme activity after 5 hours exposure to lipids.
• 13N.2.HL.TZ0.1c: Compare rates of diabetes between the two age groups studied.
• 13N.2.HL.TZ0.1f: Calculate the percentage change of enzyme activity after 5 hours exposure to lipids.
• 14N.1.SL.TZ0.24: Colonic irrigation involves regularly flushing the large intestine with water. Why should this...
• 09N.1.SL.TZ0.29: What is a role of the hypothalamus in homeostasis?A. Monitoring body temperatureB. Monitoring...
• 16M.1.HL.TZ0.35: Which discovery was an indication that the heart pumps blood to the body through arteries? A....
• 16N.1.SL.TZ0.24: What is the main method of transport of monosaccharides such as fructose across the intestinal...
• 16N.1.SL.TZ0.25: What is the position of heart valves when blood pressure is highest in the aorta?
• 17M.1.SL.TZ1.26: In which blood vessel connected to the heart does blood have the lowest carbon dioxide...
• 17M.1.SL.TZ2.24: Which is a process occurring in the small intestine? 
• 17M.1.SL.TZ2.25: What is a feature of the left atrium? A. Epinephrine decreases its rate of contraction. B. It...
• 17M.1.HL.TZ2.36: If schizophrenia is caused by an overabundance of the neurotransmitters dopamine and serotonin in...
• 17M.2.SL.TZ1.6c: Outline how leptin controls appetite.
• 17N.1.SL.TZ0.28: Which structure in the motor neuron is required for saltatory conduction? [Source:...
• 17N.1.SL.TZ0.29: Which hormone inhibits appetite? A. Epinephrine B. Leptin C. Thyroxin D. Glucagon
• 17N.1.HL.TZ0.24: What happens when an action potential reaches motor end plates? A. Calcium ions are absorbed by...
• 15M.1.SL.TZ2.28: The image shows a section of the human respiratory system. Which letter identifies a...
• 15M.1.HL.TZ2.28: What are functions of the stomach, small intestine and large intestine?
• 13M.2.HL.TZ1.6a: Describe the process of blood clotting.
• 13M.1.HL.TZ1.21: What is the state of the atrio-ventricular and semilunar valves when the left ventricle contracts?
• 13M.1.HL.TZ2.20: What causes the rate of heart contraction to increase or decrease? A. The heart muscle itselfB....
• 13M.2.SL.TZ2.7c: Explain the control of body temperature in humans.
• 13M.3.HL.TZ2.13b: Calculate the change in lung function of females with asthma between the ages of  11 and 26.
• 13M.1.SL.TZ1.26: What is the state of the atrio-ventricular and semilunar valves when the left ventricle...
• 13M.3.SL.TZ1.3a: Outline the control mechanism for appetite in humans.
• 13M.3.SL.TZ2.4c (ii): Suggest reasons for the differences between the 3000 m programme and the 6000m programme in their...
• 11M.1.HL.TZ1.25: The diagram below shows the male reproductive system. Which are the epididymis and the seminal...
• 12M.2.HL.TZ1.8b: Describe how body temperature is maintained in humans.
• 12M.1.HL.TZ1.23: Which response takes place when blood glucose levels are low? A. Glucagon is released from the α...
• 12M.1.HL.TZ1.24: During the menstrual cycle, what occurs in response to a fall in the progesterone level? A....
• 12M.1.HL.TZ2.20: Which blood vessel directly supplies oxygen to the heart muscle? A. Aorta B. Coronary artery C....
• 12M.1.HL.TZ2.21: What is a long-term effect of HIV on the immune system? A. Increase in leucocytes B. Reduction...
• 12M.1.SL.TZ2.24: What is a consequence of AIDS? A. Excess production of lymphocytes to help fight disease B....
• 09M.2.HL.TZ1.5c: Discuss the ethical issues surrounding IVF.
• 10M.2.HL.TZ1.4a: Blood is a liquid tissue containing glucose, urea, plasma proteins and other components. List the...
• 10M.2.HL.TZ2.6c: Explain why diabetes could be detected through the analysis of urine.
• 10M.1.SL.TZ1.28: What is the function of the structure labelled X? A. Gas exchange B. Ventilation C....
• 10M.1.SL.TZ2.30: Which of the following is/are a role of testosterone in males? I. Pre-natal development of male...
• 10M.1.HL.TZ1.23: Which muscles contract to cause air to pass into the lungs through the trachea? A. Internal...
• 10M.2.SL.TZ2.1d (ii): Compare the gain and loss of ions in the male moths which have drunk from laboratory solutions...
• 11N.2.SL.TZ0.2a (iii): Label the diagram to show the structure where most absorption of nutrients occurs (using the...
• 11N.1.SL.TZ0.29: What is the structure labelled X? A. Right ventricle B. Right atrium C. Left atrium D. Left...
• 12N.2.HL.TZ0.1d: Identify the effect of increasing the concentration of synthetic surfactant A on the growth of GBS.
• 12N.1.HL.TZ0.22: The concentration of which hormone peaks sharply triggering ovulation? A. FSHB. LHC. EstrogenD....
• 10N.2.SL.TZ0.6a: State four molecules transported by the blood.
• 10N.2.HL.TZ0.5b: Outline the role of hormones in the menstrual cycle.
• 10N.3.HL.TZ0.7e: Outline the mechanism of the action of antibiotics.
• 15N.1.SL.TZ0.28: What is a characteristic of type II diabetes? A. Insufficient insulin B. Insulin...
• 15N.2.SL.TZ0.4a: Draw a labelled diagram showing the interconnections between the liver, gall bladder, pancreas...
• 13N.1.SL.TZ0.24: Why are antibiotics effective against pathogenic bacteria?A. Bacteria have a high rate of...
• 13N.2.SL.TZ0.1a: Distinguish between type I and type II diabetes.
• 13N.2.SL.TZ0.1b: State the relationship between plasma fatty acid level and enzyme activity.
• 13N.2.SL.TZ0.1d: Discuss, using the data, whether the effect of lipids on this enzyme is reversible.
• 13N.2.SL.TZ0.1e: Calculate the increase in glucose absorption when insulin is increased from 0 to 103 μU ml–1 for...
• 13N.2.SL.TZ0.6a: Reproduction can cause populations to increase rapidly. Draw a labelled graph showing a sigmoid...
• 13N.2.HL.TZ0.1b: Determine the rate of new cases of type II diabetes among children of African ethnicity aged...
• 13N.2.HL.TZ0.1h: Comment on the effect of increased insulin concentration on glucose absorption in the muscle...
• 09N.1.SL.TZ0.24: What route does blood follow to supply oxygen to heart muscle?A. pulmonary vein → left atrium →...
• 09N.1.SL.TZ0.26: What stimulates the production of antibodies?A. AIDSB. AntibioticsC. AnticodonsD. Antigens
• 09N.1.SL.TZ0.27: What change occurs to the pressure and volume of the lungs when the external intercostal muscles...
• 16M.1.SL.TZ0.25: The diagram shows the layers of the tissues in a transverse section of the human small...
• 16M.1.HL.TZ0.34: In which process is “surface area” of key importance for humans? A. Reabsorption of glucose in...
• 16N.1.SL.TZ0.28: Which conditions are correct for inspiration?
• 16N.2.SL.TZ0.6b: Explain the structures and functions of arteries and veins.
• 16M.2.SL.TZ0.5c: Explain the propagation of electrical impulses along a neuron including the role of myelin.
• 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
• 17M.1.SL.TZ1.29: What helps to keep blood flowing onwards away from the heart in an artery? A. Valves B. Elastic...
• 17M.1.HL.TZ1.25: The graph shows the changes in blood glucose concentration of an untreated patient with type I...
• 17M.2.SL.TZ2.2a: Glands are organs that secrete and release particular chemical substances. Melatonin is an...
• 17M.2.SL.TZ2.1d: Discuss the effect of exercise on the results of the experiment.
• 17N.1.SL.TZ0.30: What is the name and source of the hormone that regulates basal metabolic rate?
• 17N.2.SL.TZ0.01h: Discuss whether measurements of desmosine concentration would be useful for monitoring changes in...
• 17N.2.SL.TZ0.01d: Evaluate which of the two biomarkers would be the most useful indicator of COPD severity.
• 17N.2.SL.TZ0.02b: Rotavirus causes diarrhea and vomiting. Explain why viral diseases cannot be treated using...
• 17N.2.SL.TZ0.06b: Explain how hormones are used to control the human menstrual cycle.
• 17N.2.HL.TZ0.01d.i: Analyse the graph to obtain two conclusions about the concentration of sodium–potassium pumps.    
• 15M.1.SL.TZ2.27: What is a role of the coronary arteries?A. To supply information about blood temperature to the...
• 15M.2.SL.TZ2.7b: Describe the action of the heart in pumping blood.
• 15M.2.SL.TZ1.1c: Outline the relationship between blood glucose levels after fasting and lack of FoxO1  in the...
• 15M.3.SL.TZ2.6b: Explain the processes that control changes in ventilation rate during exercise.
• 15M.3.SL.TZ2.3a : State two symptoms of type II diabetes.
• 15M.1.HL.TZ2.29: The graph shows a correlation between the number of new cases of stomach cancer and vegetable...
• 15M.2.HL.TZ1.1f: State which group of cells showed the least change in the mice studied.
• 15M.2.HL.TZ1.1b: Aging and having pregnancies are considered to be physiological stresses. Deduce the effect of...
• 15M.2.HL.TZ1.1i: When there are high blood glucose levels, more FoxO1 is found in the nucleus of the cell than in...
• 15M.3.SL.TZ1.3a: Outline the symptoms of type II diabetes.
• 13M.1.HL.TZ1.24: What is a characteristic of type II diabetes? A. Liver cells are less sensitive to insulin.B....
• 13M.2.SL.TZ1.1e: Describe the evidence for damage to synapses by OP provided by data in the box plot.
• 13M.2.SL.TZ1.5b: Explain the relationship between structure and function of arteries, capillaries and veins.
• 13M.3.SL.TZ1.4c: Discuss whether the cardiovascular system has to adjust to weightless conditions in space.
• 13M.1.SL.TZ1.28: What changes occur in the thorax of a mammal when the external intercostal muscles and diaphragm...
• 11M.3.SL.TZ2.4b: Determine the difference in backflow speed between the lying position and pedal exercise.
• 12M.1.HL.TZ1.19: What is the condition of the valves of the heart when the right ventricle is contracting?
• 09M.2.SL.TZ1.8c: Discuss the ethical issues associated with IVF.
• 09M.2.SL.TZ2.5b: Describe the relationship between the structure and function of blood vessels.
• 09M.1.HL.TZ2.16: Which of the following describes arteries? A. They have thick muscular walls.B. They usually...
• 09M.1.SL.TZ1.27: What feature of alveoli adapts them to efficient gas exchange? A. They have muscles which pump...
• 10M.1.SL.TZ1.25: What processes occur during assimilation and absorption of lipids?
• 10M.2.SL.TZ1.3b: Outline the roles of FSH in the menstrual cycle.
• 10M.1.HL.TZ2.21: What is a role of the pacemaker or sinoatrial node (SAN)? A. To initiate contraction of the...
• 11N.2.HL.TZ0.5 a: Draw a labelled diagram of the digestive system.
• 11N.1.HL.TZ0.29: What occurs during the process of ventilation? A. Contraction of external intercostal muscles...
• 12N.2.HL.TZ0.1b: Compare the composition of natural human surfactant with synthetic surfactants.
• 11N.1.SL.TZ0.28: Which hormone triggers ovulation? A. FSH B. Testosterone C. Progesterone D. LH
• 12N.1.HL.TZ0.19: What are antibodies? A. Organisms or viruses that cause diseaseB. Drugs used to treat bacterial...
• 12N.1.HL.TZ0.18: What is the direction of flow of oxygenated blood during a heartbeat? A. left atrium →...
• 10N.2.SL.TZ0.6b: Outline the control of the heartbeat.
• 09N.2.HL.TZ0.1f: Distinguish between the effects of insulin alone and exercise alone on glucose uptake in skeletal...
• 10N.2.HL.TZ0.3d: Outline why antibiotics are effective against bacteria but not against viruses.
• 15N.1.HL.TZ0.21: What causes heart ventricles to fill with blood? I. Atrial contraction II. Closing of...
• 15N.1.HL.TZ0.22: Which is the correct statement concerning HIV and AIDS? A. All HIV patients have AIDS. B. HIV...
• 13N.1.HL.TZ0.23: What muscle actions cause air to be expelled from the lungs?A. Internal intercostal muscles relax...
• 13N.1.HL.TZ0.38: What steps occur in blood clotting?A. Fibrin is converted to fibrinogen which then alters...
• 13N.1.SL.TZ0.23: What are features of the enzyme amylase?
• 13N.1.SL.TZ0.28: The diagram below shows the female reproductive system. What are the structures indicated by...
• 13N.1.SL.TZ0.30: The diagram below shows a motor neuron. What are the structures indicated by X, Y and Z?
• 14N.1.SL.TZ0.28: During expiration, how does air pressure in the lungs compare with atmospheric pressure?A. Lung...
• 09N.1.SL.TZ0.28: The graph below shows changes in membrane potential in an axon during the passage of an action...
• 09N.1.HL.TZ0.24: What is the consequence of insufficient secretion of FSH in women?A. Embryo implantation fails...
• 16M.1.HL.TZ0.33: What happens to starch in the small intestine? A. Endopeptidase secreted by the liver digests...
• 16N.1.SL.TZ0.30: Which is a negative feedback mechanism in the menstrual cycle? A. Follicle stimulating hormone...
• 17M.1.SL.TZ1.27: Which hormone promotes the thickening of the endometrium and also inhibits the hormone that...
• 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system....
• 17M.1.SL.TZ2.28: Where does gas exchange occur in the lungs? A. In type I pneumocytes B. In the bronchioles C....
• 17M.2.SL.TZ2.1c.ii: Compare and contrast the results for the water–no exercise group and the Epi–no exercise group.
• 17M.3.SL.TZ2.3b: Discuss the implications of these results for recommending leptin injections as an appetite...
• 17M.3.SL.TZ1.3a: Calculate the difference in ventilation rate between resting and exercising.
• 17N.2.HL.TZ0.01a: Outline the effect of hypoxia on body mass and erythrocyte percentage.
• 17N.2.HL.TZ0.02c: State the role of plasma cells in the immune system.
• 15M.1.HL.TZ1.22: What is a feature of the human circulatory system?A. The wall of the right ventricle of the heart...
• 15M.1.SL.TZ2.25: The graph shows a correlation between the number of new cases of stomach cancer and vegetable...
• 15M.2.SL.TZ2.7a: Draw a labelled diagram of the human heart showing the attached blood vessels.
• 15M.2.SL.TZ1.1f: Referring to the functions of insulin and glucagon, suggest how the differences in hormone levels...
• 15M.3.SL.TZ1.5b: Describe the effects of training on the pulmonary system.
• 13M.2.HL.TZ2.6c: Explain the control of body temperature in humans.
• 13M.1.HL.TZ2.37: What is the function of thrombin in the process of blood clotting? A. It acts as a catalyst.B....
• 13M.1.SL.TZ1.29: How does the body respond to an increase in body temperature? I. Vasoconstriction of skin...
• 13M.3.SL.TZ2.4a: Calculate the percentage of slow (type I) muscle fibres that contain low levels of glycogen after...
• 13M.3.HL.TZ2.13d: Explain how the units used to measure lung function are useful in showing if a person suffers...
• 13M.3.SL.TZ1.4b: Outline the response of the astronauts’ cardiovascular system to exercise before the flight.
• 11M.1.SL.TZ1.28: What normally prevents the membranes of the alveoli from sticking together during expiration? A....
• 11M.1.SL.TZ1.26: Is the blood in the aorta, left ventricle and pulmonary artery oxygenated or deoxygenated?
• 11M.3.SL.TZ1.3b: State one symptom of type II diabetes.
• 11M.3.SL.TZ2.4c: Discuss the benefits of exercising to promote high backflow speed.
• 12M.2.HL.TZ1.8a: Outline what is meant by homeostasis.
• 12M.1.HL.TZ2.24: Which of the following help to control body temperature on a very hot day? I. Shivering II....
• 12M.1.SL.TZ2.29: How is epinephrine (adrenaline) carried to the pacemaker of the heart and what effect does it...
• 12M.1.SL.TZ2.28: What is an important function of the lacteal in the villus? A. Secretion of mucus B. Secretion...
• 09M.2.SL.TZ1.8a: Draw a labelled diagram of the adult male reproductive system.
• 09M.1.SL.TZ1.30: What is the correct sequence of events used in IVF?
• 10M.1.SL.TZ1.26: The diagram below shows the human heart. What structures are indicated by the labels X, Y and Z?
• 10M.1.SL.TZ2.25: What is a correct pathway for blood flowing through the heart? A. right atrium, tricuspid valve,...
• 10M.1.HL.TZ1.25: What are the roles of testosterone in males? A. Stimulation of FSH production and growth in...
• 11N.2.HL.TZ0.1a (ii): Determine the number of hours of light needed to release the maximum number of stem cells in...
• 11N.2.HL.TZ0.1e: Compare the effect of isoprenaline and clenbuterol with the normal release of stem cells and the...
• 11N.2.HL.TZ0.6 c: Outline the hormonal control of birth.
• 11N.2.SL.TZ0.2a (ii): Label the diagram to show the structure where most absorption of water to prevent dehydration...
• 11N.1.SL.TZ0.27: Which of the following is a characteristic of type I but not type II diabetes? A. β cells in the...
• 10N.2.SL.TZ0.3b: Explain why digestion of large food molecules is essential.
• 10N.3.SL.TZ0.16d: Suggest how antibiotic-resistant bacteria are passed from animals to humans.
• 09N.2.HL.TZ0.1h: State which cells secrete insulin and the organ in which they are located. Cells: Organ:
• 09N.2.HL.TZ0.1i: State the name of one hormone other than insulin involved in the regulation of blood glucose.
• 10N.2.HL.TZ0.3a: Define the term passive immunity.
• 15N.1.SL.TZ0.27: How does the hypothalamus respond to a very high body temperature? A. Increases muscle...
• 15N.2.SL.TZ0.4b: Outline the role of glucagon in homeostasis of glucose.
• 13N.1.SL.TZ0.27: The diagram below shows the changes in membrane potential during an action potential. What...
• 13N.2.SL.TZ0.1f: Comment on the effect of increased insulin concentration on glucose absorption in the muscle...
• 13N.2.HL.TZ0.1a: Identify, among young people aged 10–19 years, which ethnic group showed the highest rate of new...
• 13N.2.HL.TZ0.7c: Membranes of pre-synaptic and post-synaptic neurons play an important role in transmission of...
• 14N.1.SL.TZ0.26: What role does the medulla of the brain have in controlling heart rate?A. To secrete adrenaline...
• 16M.1.HL.TZ0.36: Which is a valid comparison between arteries and veins?    
• 16M.1.HL.TZ0.16: What is the mechanism of sodium-potassium pumps in neurons that generates a resting potential by...
• 16M.1.HL.TZ0.37: Which statement is true for the antibiotic penicillin? A. Watson and Crick developed the usage...
• 16M.2.HL.TZ0.1h: Compare and contrast the results of the treatment on group 1 with the results of the treatment on...
• 17M.1.SL.TZ1.30: Pancreatic gland cells produce and secrete large amounts of digestive enzymes. Which organelles...
• 17M.1.HL.TZ2.32: Where is absorption of digested food carried out? I. Villi II. Pancreas III. Small...
• 17M.2.SL.TZ1.6a: Explain how the small intestine moves, digests and absorbs food.
• 17M.1.HL.TZ2.31: Where does the digestion of polypeptides start in humans? A. Mouth B. Esophagus C. Stomach D....
• 17N.2.SL.TZ0.05b: Discuss the roles of the enzymes secreted by the pancreas during digestion.
• 17N.2.HL.TZ0.01c: Using the data presented in this question, explain the effect of hypoxia on the body.
• 15M.1.HL.TZ1.21: What is a feature of neurons?A. Relay neurons transmit impulses from motor to sensory neurons.B....
• 15M.2.SL.TZ2.7c: Nerves connecting the brain and heart contain neurons that control heart rate.  Explain how a...
• 15M.2.SL.TZ1.1a: Compare blood glucose levels after fasting in young control mice and young IKO mice without FoxO1.
• 15M.1.HL.TZ2.32: What is a role of the coronary arteries? A. To supply information about blood temperature to the...
• 15M.2.HL.TZ1.1c: Outline the relationship between blood glucose levels after fasting and lack of FoxO1 in the mice...
• 13M.1.HL.TZ2.23: What initiates an action potential along a neuron? A. Potassium and sodium ions diffuse out of a...
• 13M.1.SL.TZ2.30: LH causes the rupture of a follicle and release of an egg cell.  What is this process called? A....
• 13M.3.HL.TZ2.13c: Compare the data for 26-year-old males and females.
• 13M.1.SL.TZ1.25: Which label represents the lacteal?  
• 11M.1.HL.TZ1.24: What will be happening in a person after eight hours of sleep? A. β cells in the pancreas will...
• 11M.1.HL.TZ1.22: Is the blood in the aorta, left ventricle and pulmonary artery oxygenated or deoxygenated?
• 11M.1.HL.TZ1.39: A process occurs in which the inside of a neuron develops a net positive charge compared with the...
• 11M.1.SL.TZ2.10: Which structure produces lipase? A. 1 B. 2 C. 4 D. 5
• 11M.1.SL.TZ2.13: Between which structures do sensory neurons carry nerve impulses? A. From receptors to muscles ...
• 12M.2.HL.TZ1.3a: Outline the mechanisms involved in the control of heartbeat.
• 12M.2.HL.TZ1.5b: Describe the importance of hydrolysis in digestion.
• 12M.2.HL.TZ2.3b: Describe three features of alveoli that adapt them to gas exchange.
• 12M.1.HL.TZ1.21: What is a feature of alveoli? A. They occur in all animals because they are needed for gas...
• 12M.1.HL.TZ2.38: The diagram shows the adult female reproductive system. Which label shows the cervix and which...
• 12M.1.SL.TZ1.27: What is a similarity between arteries and capillaries? A. They both have elastic tissue. B. They...
• 12M.2.SL.TZ1.7c: Explain the need for a ventilation system and the mechanism of ventilation of the lungs in humans.
• 12M.2.SL.TZ1.5b: Describe the importance of hydrolysis in digestion.
• 09M.1.HL.TZ2.17: What is the main function of the large intestine? A. Absorption of waterB. Digestion of fats and...
• 10M.2.HL.TZ1.4b: Outline how the human body prevents blood glucose concentration from rising excessively.
• 10M.1.SL.TZ2.26: Why are antibiotics effective against bacteria? A. They can produce specific antibodies. B. They...
• 10M.1.SL.TZ2.28: What is an effect of the HIV virus on the immune system? A. Reduction of the number of...
• 10M.1.SL.TZ2.29: What happens to the external and internal intercostal muscles and diaphragm when inhaling?
• 10M.1.HL.TZ1.24: The diagram below shows the changes in membrane potential during an action potential. What occurs...
• 10M.2.SL.TZ2.5c: Explain the importance of enzymes to human digestion.
• 10M.1.HL.TZ2.24: The diagram below shows water in the human body. Where in the digestive system is the largest...
• 11N.2.HL.TZ0.1b: Distinguish between the trends shown in the number of stem cells per ml blood by the mice...
• 12N.2.HL.TZ0.1e: Compare the effect of the three surfactants, synthetic surfactants A and B and the modified human...
• 12N.2.SL.TZ0.7c: Explain the principles of synaptic transmission.    
• 12N.2.SL.TZ0.5c: Describe the digestion of food in the human digestive system.          
• 10N.2.HL.TZ0.1a(ii): The activity of α-amylase was tested at successive concentrations of gibberellin. Determine the...
• 09N.2.HL.TZ0.1b: Explain the difference in blood insulin concentrations between the two groups of mice.
• 09N.2.HL.TZ0.1d: Deduce, with a reason, whether transgenic IDE −/− mice are an appropriate model of type II diabetes.
• 09N.2.HL.TZ0.2d: Explain why antibiotics are ineffective against viruses.
• 15N.1.SL.TZ0.24: What structures in the small intestine transport most fats? A. Collecting ducts B....
• 15N.1.SL.TZ0.29: Which two hormones promote thickening of the endometrium? A. FSH and LH B. Estrogen and FSH C....
• 15N.1.HL.TZ0.24: How does the hypothalamus respond to a very high body temperature? A. Increases muscle...
• 15N.2.HL.TZ0.8a: Draw a labelled diagram to show the structure of the heart.
• 13N.1.HL.TZ0.24: The diagram below shows the changes in membrane potential during an action potential. What...
• 13N.2.HL.TZ0.1g: Discuss, using the data, whether the effect of lipids on this enzyme is reversible.
• 14N.1.SL.TZ0.27: Which is a long-term effect of the human immunodeficiency virus (HIV) on the immune system?A....
• 16M.1.SL.TZ0.30: How can knowledge about the pineal gland function be applied? A. To restore sleep time by the...
• 16M.1.SL.TZ0.28: The diagram shows changes of pressure during the cardiac cycle.   Which is an explanation of...
• 16N.1.SL.TZ0.29: Which hormone controls circadian rhythms? A. ThyroxinB. MelatoninC. LeptinD. Glucagon
• 16M.2.HL.TZ0.2a: (i) Using the nomogram, state the lower weight limit for a woman with the height...
• 16M.2.HL.TZ0.3b: All motor neurons use acetylcholine to activate skeletal muscle. Explain the effect of...
• 16N.2.HL.TZ0.2a: The image is an electron micrograph of the lining of the small intestine. (i) Label the...
• 16M.2.HL.TZ0.1e: Evaluate the effectiveness of the embryonic stem cell treatment in controlling blood glucose.
• 16N.2.SL.TZ0.6a: Outline the exchange of materials between capillaries and tissues.
• 16N.2.HL.TZ0.6a: Explain how circulation of the blood to the lungs and to other systems is separated in humans and...
• 17M.1.SL.TZ1.24: The diagram below shows part of the membrane of a neuron. What stage of the action potential does...
• 17M.1.SL.TZ2.29: If schizophrenia is caused by an overabundance of the neurotransmitters dopamine and serotonin in...
• 17M.3.SL.TZ2.3c.i: State the tissue that produces leptin in humans.
• 17N.1.SL.TZ0.25: The diagram shows red blood cells and undifferentiated tissue cells. [Source: © International...
• 17N.2.SL.TZ0.01f: State the relationship between diffusion capacity and urine desmosines.
• 17N.1.HL.TZ0.25: The graph shows changes in an individual’s blood glucose concentration over time. What...
• 15M.1.HL.TZ1.24: Which hormone shows the greatest fall in blood concentration just before menstruation?A. FSH...
• 15M.2.SL.TZ1.3d: Outline how nerve impulses are transmitted along a nerve fibre.
• 15M.2.HL.TZ2.6b: Describe the action of the heart in pumping blood.
• 15M.2.SL.TZ1.1b (ii): Aging and having pregnancies are considered to be physiological stresses.  Deduce the effect of...
• 15M.2.SL.TZ1.1e: State the correlation between lack of FoxO1 and pancreatic hormones in mice.
• 15M.2.SL.TZ1.5b: Bacteria are prokaryotes that sometimes act as pathogens. Describe how the body can defend itself...
• 15M.1.HL.TZ2.34: What happens when human body temperature rises during exercise? A. The arterioles move closer to...
• 15M.1.HL.TZ2.33: What characterizes type I diabetes? A. It can be controlled by diet alone.B. Risk factors such...
• 15M.2.HL.TZ1.1a: Compare blood glucose levels after fasting in young control mice and young IKO mice without FoxO1.
• 15M.2.HL.TZ1.6c: Active skeletal muscle requires a good supply of oxygen. Outline the mechanism of ventilation in...
• 15M.2.HL.TZ1.1g: Deduce the effects of aging on the distribution of cell types in mice.
• 15M.2.HL.TZ1.1h: A hypothesis has been suggested that diabetes is caused by β cells losing their ability to act as...
• 15M.2.HL.TZ1.1e: State the correlation between lack of FoxO1 and pancreatic hormones in mice.
• 13M.1.HL.TZ1.23: Immediately after an action potential, which event causes the neuron membrane to repolarize? A....
• 13M.1.HL.TZ1.22: What are the conditions of the blood travelling through the pulmonary vein?
• 13M.1.HL.TZ1.25: What is the function of LH (luteinizing hormone) in the menstrual cycle? A. Development of...
• 13M.2.SL.TZ1.1d: Calculate the difference in median area of synapse between the control mice and mice treated with...
• 13M.1.HL.TZ2.21: Why do nutrient molecules enter the blood? A. Blood carries nutrients to cells.B. Blood converts...
• 13M.1.HL.TZ2.24: Why does shivering occur? A. The body cannot control muscles when they become cold.B. Shivering...
• 13M.2.SL.TZ1.1a: State the minimum ratio at which some mice showed no symptoms.
• 13M.2.SL.TZ1.1c: Predict what would happen if a mouse received 300 mg of rAChE and 600 mg of OP.
• 13M.1.SL.TZ2.28: The diagram shows a feedback pathway. Which sequence is an example of the pathway?
• 13M.3.SL.TZ2.3b: List two reasons for increases in the rate of clinical obesity. 1. ...
• 13M.3.SL.TZ1.5d: Explain the changes in ventilation rate during exercise.
• 11M.1.HL.TZ1.23: Which of the following statements about antibodies is correct? A. Antibodies are polypeptides. ...
• 11M.3.SL.TZ2.4a (i): State which activity reduces backflow speed in relation to the control.
• 11M.3.SL.TZ2.4a (ii): Suggest a reason why backflow speed is reduced by the activity stated in (a)(i).
• 12M.2.HL.TZ2.3c: Explain how the structure of capillaries relates to their functions.
• 12M.2.HL.TZ2.5b: Outline the digestion, absorption and assimilation of proteins in humans.
• 12M.1.SL.TZ1.24: The diagram below shows the human digestive system. In which parts of the digestive system are...
• 09M.1.HL.TZ2.14: Which muscle action is associated with an increase in the volume of the thoracic cavity when...
• 10M.2.HL.TZ2.2d (i): The graphs below show the normal menstrual cycle. Predict, with a reason, how the graphs will...
• 10M.2.SL.TZ1.3c: FSH is secreted by the pituitary gland. During pregnancy, FSH secretion is inhibited. Suggest how...
• 10M.2.SL.TZ1.6a: The pumping of blood is a vital process. Explain the roles of the atria and ventricles in the...
• 10M.2.SL.TZ1.3a: Identify hormones I and II. I:...
• 10M.2.SL.TZ2.4c: Sketch the hormone changes between days 13 and 28 on the graphs below for a woman in her normal...
• 10M.1.HL.TZ1.35: What occurs during the blood clotting process? A. Prothrombin is converted into thrombin which...
• 10M.1.HL.TZ1.21: What prevents antibiotics from being effective against viruses? A. Viruses have a high rate of...
• 11N.2.HL.TZ0.3 b: Hemophilia is a disorder where the ability to control blood clotting or coagulation is impaired....
• 11N.1.HL.TZ0.30: Which term describes the phase of rapid entry of sodium ions (Na+) into an axon during an action...
• 11N.1.SL.TZ0.30: What is a role of the coronary arteries? A. To transport oxygen from the lungs directly to the...
• 12N.1.HL.TZ0.20: The diagram shows events at a synapse. What is happening at the point labelled X? A....
• 12N.1.SL.TZ0.25: A structure has a thin epithelium of one cell layer and contains a lacteal and blood capillaries....
• 09N.2.SL.TZ0.3b: Outline the need for enzymes in the digestive system.
• 09N.2.SL.TZ0.4a: The diagram below shows the female reproductive system. Label the diagram above with the...
• 09N.2.HL.TZ0.1e: Explain the reason for the differences in insulin-stimulated glucose uptake between control mice...
• 13N.1.SL.TZ0.29: What is the body’s response to low blood glucose levels?A. Alpha cells in the pancreas secrete...
• 13N.2.SL.TZ0.7c: Membranes of pre-synaptic and post-synaptic neurons play an important role in transmission of...
• 13N.2.HL.TZ0.1d: (i) Compare the relative proportions of type I and type II diabetes between the different ethnic...
• 14N.1.SL.TZ0.29: Where do motor neurons conduct impulses from and to?A. From effectors to the central nervous...
• 14N.1.SL.TZ0.30: What are increasing levels of progesterone responsible for during the female menstrual cycle?A....
• 09N.1.SL.TZ0.30: What is the sequence of operations during IVF treatment?A. egg collection → FSH injections →...
• 16N.1.HL.TZ0.24: The decline in European honeybee (Apis mellifera) populations may be linked to neonicotinoid...
• 16N.1.HL.TZ0.22: In Florey and Chain’s experiment, eight mice were infected with lethal doses of Streptococcus...
• 16M.2.HL.TZ0.2c: Describe how the hormone leptin helps to prevent obesity.
• 17M.1.HL.TZ2.35: What is essential for conduction of nerve impulses to be saltatory? A. Wrapping of myelin around...
• 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
• 17M.2.SL.TZ2.1c.i: State the time when the point of fatigue occurred in the Epi–exercise group.
• 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
• 17M.3.SL.TZ1.3b: Explain the change in the tidal volume during exercise.
• 17M.2.HL.TZ2.7c: Explain the roles of specific hormones in the menstrual cycle, including positive and negative...
• 17M.3.SL.TZ2.3c.ii: State the target that leptin normally acts on.
• 17N.2.SL.TZ0.01e: Elastin is also an important component of other tissues such as arteries and ligaments. Evaluate...
• 17N.1.SL.TZ0.26: What is a characteristic of antigens? A. They recognize foreign substances B. They are produced...
• 17N.2.SL.TZ0.01a: State the level of COPD that has the lowest FEV.
• 17N.2.HL.TZ0.01b: Using the data in the graph, deduce whether hypoxia increases or decreases the endurance of the...
• 17N.2.HL.TZ0.01d.ii: Muscle fibres are stimulated to contract by the binding of acetylcholine to receptors in their...
• 17N.2.HL.TZ0.01g: Discuss the advantages and disadvantages of using rats as models in this investigation.
• 17N.1.HL.TZ0.23: Which type of cell is specialized to facilitate gas exchange? A. Type I pneumocytes B. Type II...
• 15M.1.SL.TZ2.29: What characterizes type I diabetes?A. It can be controlled by diet alone.B. Risk factors such as...
• 15M.1.SL.TZ2.30: What happens when human body temperature rises during exercise?A. The arterioles move closer to...
• 15M.2.SL.TZ1.1b (i): Estimate the difference between mean blood glucose levels in control and IKO older female...
• 15M.3.SL.TZ2.6a: Define tidal volume and ventilation rate. Tidal volume:       Ventilation rate:  
• 15M.1.HL.TZ2.35: What happens during synaptic transmission? A. K+ enters the postsynaptic membrane.B. A...
• 15M.1.HL.TZ2.36: The graph is about defence against infectious disease. What is likely to be indicated by the...
• 13M.2.HL.TZ1.8b: A supply of oxygen is needed for aerobic respiration in mitochondria. Describe the...
• 13M.1.HL.TZ2.19: Enzymes produced by the pancreas could pass out of the body via the anus. Which route would these...
• 13M.2.SL.TZ1.5c: Outline how leucocytes defend the body against pathogens.
• 13M.2.SL.TZ2.6c: Explain the mechanism of ventilation in the lungs in order to promote gas exchange for cell...
• 13M.1.SL.TZ1.30: Oral contraceptives taken by women contain the hormone progesterone.  How does this prevent...
• 12M.2.HL.TZ2.3a (i): Blood transports molecules throughout the body. State where the blood absorbs hormones.
• 12M.2.HL.TZ1.4a: Outline the process of in vitro fertilization (IVF).
• 12M.2.HL.TZ2.3a (ii): Blood transports molecules throughout the body. State where the blood absorbs carbon dioxide.
• 12M.1.HL.TZ1.20: What effect does HIV have on the immune system? A. It prevents leucocytes from fighting bacteria...
• 12M.1.HL.TZ2.19: What is an important function of the lacteal in the villus? A. Secretion of mucus B. Secretion...
• 12M.1.HL.TZ2.22: The diagram shows the ventilation system in humans. What is the function of the structure...
• 12M.1.HL.TZ2.23: Which of the following are controlled by homeostasis? I. Blood pH II. Water balance III. Blood...
• 09M.2.HL.TZ2.5b: Outline the roles of progesterone and estrogen in the human menstrual cycle
• 09M.1.HL.TZ1.21: The diagram below represents the homeostatic control of body temperature. What does the part...
• 09M.1.HL.TZ1.22: What are the structures labelled I and II on the diagram of the male reproductive system?
• 09M.2.SL.TZ1.6c: Explain how the structure of a villus in the small intestine is related to its function.
• 10M.1.SL.TZ1.24: Which of the following is correct for lipase?
• 10M.1.SL.TZ2.27: Which of the following features of the alveoli adapt them to gaseous exchange? I. Single layer...
• 10M.2.SL.TZ2.7c: Explain how an impulse passes along the membrane of a neuron.
• 11N.2.HL.TZ0.1 f (i): Outline the effect of CXCL12 inhibition on the incidence of diabetes.
• 11N.2.HL.TZ0.1 g: Evaluate the possible use of isoprenaline in the treatment of diabetes.
• 11N.1.HL.TZ0.27: Where does most assimilation take place? A. In cells B. In the mouth C. In the small intestine...
• 10N.2.SL.TZ0.3c: Outline why antibiotics are effective against bacteria but not against viruses.
• 09N.2.HL.TZ0.1a: Calculate the percentage increase between mean blood insulin levels in IDE + /+ mice and those in...
• 09N.2.SL.TZ0.3a: Deduce from where in the human digestive system this enzyme was extracted.
• 09N.2.HL.TZ0.2c: Discuss how the HIV virus is transmitted.
• 15M.1.HL.TZ1.20: Some egg white protein was heated until it turned solid. It was then cooled and cut into four...
• 15N.1.SL.TZ0.26: Which is the correct statement concerning HIV and AIDS? A. All HIV patients have AIDS. B. HIV...
• 15N.2.SL.TZ0.7a: Draw a labelled diagram of a motor neuron.
• 15N.2.SL.TZ0.7b: Explain how an impulse passes along the membrane of a neuron.
• 15N.2.HL.TZ0.6b: Explain how an impulse passes along the axon of a neuron.
• 15N.2.HL.TZ0.8b: Outline how the human body responds to high blood glucose levels.
• 13N.2.HL.TZ0.1e: State the relationship between plasma fatty acid level and enzyme activity.
• 16N.1.SL.TZ0.26: Why is penicillin not used in the treatment of human immunodeficiency virus (HIV)? A. HIV...
• 16N.2.SL.TZ0.6c: Describe what happens in alveoli.
• 16M.2.HL.TZ0.3a: The image shows a transverse section of an intestinal wall at 100 x magnification. Identify...
• 17M.1.SL.TZ2.26: The diagram shows the human heart. Which shows the sequence of blood flow in the heart? A....
• 17M.1.HL.TZ1.23: Which organ in the human body secretes lipase, amylase and protease? A. Pancreas B. Liver C....
• 17M.2.HL.TZ1.6b: Outline how antibiotics offer protection from certain forms of infectious disease.
• 17M.3.SL.TZ2.3a: Distinguish between the effect of leptin injection on 24 hour food intake in the mice fed the...
• 17N.2.SL.TZ0.01b: Explain how a low FEV can be used to indicate emphysema.
• 17N.2.SL.TZ0.01c: State the disease severity group that has the highest range of plasma desmosines.
• 17N.2.HL.TZ0.01e.ii: Hypoxia caused a 13 % increase in the surface area to volume ratio of the diaphragm. Suggest a...