2.3.6

The Heart - Function

Test yourself

The Heart Pumping

A group of cells in the right atrium act as a pacemaker, controlling the pumping heart. When a heart beats:

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Blood enters via the atria

  • Blood enters the heart via the atria.
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Atria contract

  • Once filled with blood, the atria contract, forcing blood down into the ventricles below.
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Ventricles contract

  • When the ventricles contract, they force blood to exit the heart.

Jump to other topics

1Cell Biology

2Organisation

2.1Principles of Organisation

2.2Enzymes

2.3Circulatory System

2.4Non-Communicable Diseases

2.5Plant Tissues, Organs & Systems

3Infection & Response

4Bioenergetics

5Homeostasis & Response

6Inheritance, Variation & Evolution

7Ecology

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