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Cambridge IGCSE Biology practice

Paper 4 structured question: Heart

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4

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4

Marks

Topic

Heart

Exam-style question

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Paper 4Theory (Extended)4 marks

The heart pumps blood by contracting its muscles and using valves to control blood flow.

Diagram Description

Heart Function

A diagram shows the four chambers of the heart with valves between atria and ventricles and at the exits of ventricles.

StepAction
1Atrial muscles contract
2Blood moves into ventricles
3Ventricular muscles contract
4Blood is pumped out of the heart
5Valves prevent backflow
  1. a

    Describe how the contraction of the atrial and ventricular muscles helps the heart to pump blood.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Describe the role of the valves during the heart's pumping cycle.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Heart

Paper 4Theory (Extended)3 marks

Description

Heart Pumping Action

The heart has atrial and ventricular muscles that contract in sequence. Valves between chambers and at exits prevent backflow.

  1. a

    Identify which muscles contract first during the heart cycle.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how the valves help blood flow through the heart.

    Aim for approximately 2 distinct marking points.

    [2]