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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)4 marks

Capillaries are tiny blood vessels that connect arteries and veins and are involved in the exchange of substances between blood and body tissues.

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]

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Paper 4 structured question: Blood vessels

Paper 4Theory (Extended)2 marks

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]