The Heart - Function
Biology: AQA GCSE Higher, topic 2.3.6
The Heart Pumping
A group of cells in the right atrium act as a pacemaker, controlling the pumping heart. When a heart beats:
Blood enters via the atria
- Blood enters the heart via the atria.
Atria contract
- Once filled with blood, the atria contract, forcing blood down into the ventricles below.
Ventricles contract
- When the ventricles contract, they force blood to exit the heart.
Test yourself on The Heart - Function
The Beating Heart
Why does the heart contain valves?