The heart and double circulation in 3D

Watch blood cells travel round both circuits, blue when deoxygenated and red after the lungs, while the atria and ventricles contract in turn.

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Questions students ask

Why is it called double circulation?

Blood passes through the heart twice on each complete trip: once to be pumped to the lungs (right side) and once to be pumped round the body (left side).

Why is the left ventricle wall thicker?

It pumps blood all round the body at high pressure; the right ventricle only pumps to the nearby lungs.

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