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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Heart

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4

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4

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Heart

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Paper 4Theory (Extended)4 marks

Understanding the heart's operation is essential for studying the circulatory system.

Description

Heart Operation

The heart operates through coordinated contractions of its muscles and the functioning of valves that regulate blood flow.

  1. a

    Describe the sequence of events during a heartbeat.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 4 structured question: Heart

Paper 4Theory (Extended)3 marks

Description

Heart Function

The heart consists of four chambers and valves that regulate blood flow. The atria contract first, followed by the ventricles, ensuring efficient circulation.

  1. a

    Explain how the contraction of the atrial and ventricular muscles contributes to the heart's function.

    Aim for approximately 3 distinct marking points.

    [3]