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DP IB Biology: SL

Topic Questions

Home / IB / Biology: SL / DP / Topic Questions / 6. Human Physiology / 6.2 The Blood System / Structured Questions: Paper 2


6.2 The Blood System

Question 1a

Marks: 3
a)

The following diagram shows the internal structure of the heart.7Lyl7pVl_e-1a

A and C represents two heart chambers.

i)
Label chambers A and C.

[2 marks]

ii)

State one difference in the function of A and C.

[1 mark]

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    Question 1b

    Marks: 1
    b)

    State the main difference between the blood found in the chambers on the left and right side of the heart.

    [1 mark]

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      Question 1c

      Marks: 2
      c)

      Structure B plays an important role in the flow of blood through the heart.

      i)

      Label structure B.

      [1 mark]

      ii)

      State the role of structure B in the flow of blood through the heart.

      [1 mark]

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        Question 1d

        Marks: 1
        d)

        Structure D is a wall of muscular tissue.

        Describe the purpose of structure D in the heart.

        [1 mark]

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          Question 2a

          Marks: 2
          a)

          The following diagram compares the structure of two main blood vessels in the body.

          6-2-easy-q2a

          i)

          Identify blood vessel A.

          [1 mark]

          ii)

          State a reason for your answer in part i).

          [1 mark]

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            Key Concepts
            Arteries
            Veins

            Question 2b

            Marks: 2
            b)

            Blood vessel B has a very large lumen.

            i)

            Identify blood vessel B.

            [1 mark]

            ii)

            State one reason for the presence of a large lumen in blood vessel B.

            [1 mark]

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              Question 2c

              Marks: 2
              c)

              The flow of blood in veins is not assisted by the pressure generated by the beating of the heart.

              List two structures that assist with the flow of blood in veins.

              [2 marks]

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                Key Concepts
                Veins

                Question 2d

                Marks: 1
                d)

                Systolic pressure is one of the measurements taken by a doctor to determine the blood pressure of a patient.

                Define the term 'systolic pressure'.

                [1 mark]

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                  Key Concepts
                  Arteries

                  Question 3a

                  Marks: 2
                  a)

                  The following diagram shows part of the blood circulation of a mammal.

                  SKefWwjT_e-3a

                  i)

                  Identify one example of an artery in this diagram. 

                  [1 mark]

                  ii)

                  Based on the information in the diagram, state a reason for your answer in part i).

                  [1 mark]

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                    Key Concepts
                    Double Circulation

                    Question 3b

                    Marks: 1
                    b)

                    Mammals have two separate circulations that supply blood to different organs.

                    State the name of the circulation that blood vessels T and S form part of.

                    [1 mark]

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                      Key Concepts
                      Double Circulation

                      Question 3c

                      Marks: 2
                      c)

                      The following table shows the mean pressure (in mmHg) measured in different blood vessels of the body.

                      Blood vessel Mean blood pressure / mmHg
                      Aorta 94
                      Arteries 90
                      Arterioles 68
                      Capillaries 24
                      Venules 10
                      Veins 3
                      Vena Cava 2

                      Calculate the percentage difference between the mean blood pressure of the aorta and vena cava. Show your working and give your answer to three significant figures.

                      [2 marks]

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                        Key Concepts
                        Arteries
                        Veins

                        Question 3d

                        Marks: 1
                        d)

                        Using the table provided, identify the blood vessels where the greatest decrease in mean blood pressure occurs.

                        [1 mark]

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                          Key Concepts
                          Arteries
                          Capillaries

                          Question 4a

                          Marks: 1
                          a)

                          The following diagram compares the structure of an artery of a healthy person with that of someone suffering from atherosclerosis.

                          6-2-easy-q4a

                          Identify structure X.

                          [1 mark]

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                            Key Concepts
                            Atherosclerosis

                            Question 4b

                            Marks: 1
                            b)

                            Atherosclerosis can lead to the occlusion of arteries over time.

                            Define the term 'occlusion'.

                            [1 mark]

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                              Key Concepts
                              Atherosclerosis

                              Question 4c

                              Marks: 2
                              c)

                              Occlusion of the arteries can have a serious impact on cardiovascular health.

                              List two consequences of an occlusion of the arteries.

                              [2 marks]

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                                Key Concepts
                                Atherosclerosis

                                Question 4d

                                Marks: 1
                                d)

                                When blood flow to part of the heart muscle is restricted it will impair its ability to contract fully. This will reduce blood flow, and therefore oxygen flow, to the body tissues.

                                State one way in which the heart will compensate for this.

                                [1 mark]

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                                  Key Concepts
                                  Atherosclerosis

                                  Question 5a

                                  Marks: 5

                                  One mark is available for clarity of communication throughout this question.

                                  a)

                                  Atherosclerosis results in a build-up of fatty deposits known as plaque inside arteries, which may lead to coronary heart disease.

                                  Outline the risk factors for developing atherosclerosis.

                                  [5 marks]

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                                    Key Concepts
                                    Atherosclerosis

                                    Question 5b

                                    Marks: 3
                                    b)

                                    Capillaries provide the exchange surface in the tissues of the body.

                                    List three characteristics of capillaries.

                                    [3 marks]

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                                      Key Concepts
                                      Capillaries

                                      Question 5c

                                      Marks: 6
                                      c)

                                      Describe the flow of oxygenated blood through the left side of the heart as it returns from the lungs.

                                      [6 marks]

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