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

1.1What's in Cells?

1.2Cell Division

1.3Transport in Cells

2Organisation

2.1Principles of Organisation

2.2Enzymes

2.3Circulatory System

2.4Non-Communicable Diseases

2.5Plant Tissues, Organs & Systems

3Infection & Response

4Bioenergetics

5Homeostasis & Response

5.1Homeostasis

5.2The Human Nervous System

5.3Hormonal Coordination in Humans

5.4Plant Hormones

6Inheritance, Variation & Evolution

7Ecology

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