DOPAMINE / SCIENCE PHOTO LIBRARY DOPAMINE / SCIENCE PHOTO LIBRARY
Valve in a human heart's left ventricle. View of hearstrings (centre) supporting a valve (top right), taken from the left ventricle. The heart has a complex system of chambers which expand and contract to pump blood around the body. The left ventricle is one of the heart's four chambers. It receives oxygenated blood from the lungs and then pumps it through the aortic valve to the rest of the body.
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