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The heart as a whole is an organ. It has 4 chambers - the right and left atria which collect blood from the body and the left and right ventricles which send blood around the body.

The left atrium collects oxygenated blood from the lungs then pushes this blood into the left ventricle which then contracts and pumps the blood around the body. The deoxygenated blood is then collected into the right atrium, which pushes it into the right ventricle which in turn pumps the deoxygenated blood to the lungs where it is reoxygenated then sent back to the left atrium so the cycle can start again.

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14y ago

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