3.3.21

Function of the Heart

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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

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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