| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.HL.TZ1.18 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 18 | Adapted from | N/A |
Question
Cells on the surface of intestinal villi have microvilli, which provide a large surface area for absorption. State another structural characteristic of these villus cells that adapts them to the absorption of nutrients.
Markscheme
a. tight junctions
b. protein channels / membrane pumps
c. large number of mitochondria
Examiners report
Syllabus sections
- 22M.1.HL.TZ1.40: What is the role of HCG in early pregnancy? A. It prevents the degeneration of the corpus...
- 18N.3.SL.TZ0.18a: On the diagram, label the epithelial cell layer.
- 18M.3.HL.TZ2.20a: State the disease caused by Helicobacter pylori.
- 18M.3.SL.TZ2.16a: Explain the relationship between infection by the bacterium Vibrio cholerae and dehydration.
- 18M.3.HL.TZ2.20c: Explain why proton pump inhibitors alleviate the symptoms of H. pylori infections.
- 18M.3.SL.TZ1.18a: State one role of fibre in the diet.
- 17M.1.SL.TZ1.10: The graph shows the effect of increasing the substrate concentration on the rate of an...
- 19N.3.SL.TZ0.17a.ii: State the type of gland that secretes juices into the digestive system.
- 17M.3.SL.TZ1.18b: Pancreatic juice is secreted into the pancreatic duct which carries these secretions to the...
- 17N.3.SL.TZ0.17a: State the relationship between gastric acidity and GI damage.
- 20N.3.HL.TZ0.21c.i: There are times when pathogenic bacteria infect the stomach, causing ulcers. State a...
- 19N.3.SL.TZ0.17b.i: State where this type of cell can be found in the digestive system.
- 20N.3.HL.TZ0.21a: Outline the function of the stomach in food digestion.
- 19M.3.SL.TZ1.18a: Hypochlorhydria is a condition whereby patients produce low quantities of stomach acid....
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17N.3.SL.TZ0.17b:
GI damage can include ulcers. Outline the treatment of stomach ulcers.
- 18M.3.SL.TZ1.18c: Outline the role of intestinal villi.
- 18M.3.HL.TZ1.19b: Distinguish between gastric juice and pancreatic juice using the table.
- 17M.3.SL.TZ2.19b: Explain the use of proton pump inhibitors to treat patients complaining of stomach pain.
- 17M.3.HL.TZ2.20: Outline how infection by Vibrio cholerae can lead to dehydration.
- 19N.3.SL.TZ0.17a.i: State one mechanism that controls gastric secretion.
- 18M.3.SL.TZ2.17: The bar chart indicates that both males and females in the US eat, on average, less fibre...
- 19N.3.SL.TZ0.16c: State one material not produced by the human body that is egested from the digestive system.
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20N.3.SL.TZ0.17b:
Explain how Helicobacter pylori can cause stomach ulcers.
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20N.3.SL.TZ0.17a:
The table shows the origin and function of gastric secretions in the digestive system.
Identify the missing items by completing the table.
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20N.3.HL.TZ0.21c.ii:
There are times when pathogenic bacteria infect the stomach, causing ulcers.
Explain how proton pump inhibitors (PPIs) reduce conditions that favour ulcer formation.
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19M.3.HL.TZ2.20a:
State the name of the bacterium that can cause stomach ulcers.
- 18N.3.HL.TZ0.18d: Explain how epithelial cells in the gut are adapted for absorption.
- 19M.3.HL.TZ1.23b: The bacterium secretes an enzyme that breaks down urea, resulting in an increase in pH....
- 19M.3.HL.TZ1.23a: Outline the possible consequences of a Helicobacter pylori infection of the stomach wall.
- 19M.3.HL.TZ1.23c: Explain hormonal control of gastric secretion.
- 19M.3.HL.TZ2.20c: Components of gastric juice have been thought to aggravate the development of ulcers. Outline...
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19M.3.HL.TZ2.20b:
Compare and contrast the effect of adding antioxidants to nizatidine on the ulcer healing rate.
- 18M.3.HL.TZ2.20b: Outline how gastric acid is produced in the stomach.
- 20N.3.HL.TZ0.21b: State a mechanism by which the stomach destroys pathogens.
- 19M.3.HL.TZ2.20d: Gastric juice production can be inhibited by the hormone secretin which is a polypeptide....
- 18M.3.SL.TZ1.18b: Outline control of digestive juice secretion so that digestive juices are only secreted into...
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17N.3.SL.TZ0.17c:
Other than gastric acidity, state a primary cause of stomach ulcers.
- 18N.3.SL.TZ0.18b: Explain how the epithelial cells are adapted for absorption.
- 19N.3.SL.TZ0.17b.ii: Outline two adaptations of this cell to its function that are visible in this electron...
- 19M.3.SL.TZ1.18b: Explain the mechanisms that regulate the composition of gastric juices.
- 19M.3.SL.TZ2.19: Gastric juice is secreted by the wall of the stomach. Explain how the timing of secretion is...
- 17M.3.HL.TZ1.21b.ii: Explain how the increase in CO2 concentration affects the release of oxygen to respiring cells.
- 17M.3.SL.TZ1.18a: State two roles of hydrochloric acid in gastric juice. Role 1: Role 2:
- 17M.3.SL.TZ1.18c: State one cause of stomach ulcers.
- 17M.3.SL.TZ2.19a: Outline the importance of the proton pumps in the digestion of foods.
- 19N.2.HL.TZ0.1h: Using all the data, discuss whether inoculating mice with the antigen to B. burgdorferi could...
- 19N.3.HL.TZ0.20c: State one material not produced by the human body that is egested from the digestive system.
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18N.3.HL.TZ0.18e:
In order to compare the absorption of fat and of glucose in the digestive system, state in the table, using yes or no, whether the processes occur.
