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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)2 marks

Double circulation in mammals

Diagram Description

Diagram of double circulation in mammals

A simplified diagram shows the heart with two sides: the right side connected to the lungs and the left side connected to the body. Arrows indicate blood flow from the body to the right side, then to the lungs, then to the left side, and finally to the body.

  1. a

    Describe Describe the process of double circulation in mammals using the diagram.

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Paper 4 structured question: Circulatory systems

Paper 4Theory (Extended)2 marks

Description

Description of blood flow in mammals

Blood flows from the body to the right atrium, then to the right ventricle, then to the lungs. Oxygenated blood returns to the left atrium, then to the left ventricle, and is pumped to the body.

  1. a

    Identify Identify which side of the heart pumps blood to the lungs and which side pumps blood to the body.

    Aim for approximately 2 distinct marking points.

    [2]