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Cambridge IGCSE Biology practice

Paper 4 structured question: Blood vessels

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Blood vessels

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Paper 4Theory (Extended)2 marks

Capillaries play a key role in the circulatory system by allowing exchange between blood and tissues.

Description

Capillary Function

Capillaries have very thin walls and a narrow diameter to facilitate exchange of gases, nutrients, and waste products between blood and body cells.

  1. a

    Identify two structural features of capillaries that help their function.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Blood vessels

Paper 4Theory (Extended)4 marks

Diagram Description

Diagram of a Capillary

The diagram shows a capillary with a very thin wall made of a single layer of cells and a narrow lumen.

  1. a

    Explain how the structure of capillaries is suited to their specific functions.

    Aim for approximately 4 distinct marking points.

    [4]