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Cambridge IGCSE Biology practice

Paper 4 structured question: Circulatory systems

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Circulatory systems

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Paper 4Theory (Extended)1 marks

Fish have a single circulatory system that differs from the double circulatory system found in mammals.

Description

Comparison of Circulatory Systems

Single circulation involves blood passing through the heart once per circuit, while double circulation involves blood passing through the heart twice per circuit.

  1. a

    Identify one key difference between single circulation in fish and double circulation in mammals.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Circulatory systems

Paper 4Theory (Extended)2 marks

Diagram Description

Single Circulation in Fish

A diagram shows the heart pumping deoxygenated blood to the gills, where it becomes oxygenated. The oxygenated blood then flows to the body tissues before returning to the heart.

StepDescription
1Heart pumps deoxygenated blood to the gills
2Blood is oxygenated at the gills
3Oxygenated blood flows to the body
4Deoxygenated blood returns to the heart
  1. a

    Describe the process of single circulation in fish.

    Aim for approximately 2 distinct marking points.

    [2]