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Valve
A valve is a structure that regulates the direction of flow. The heart is a special kind of pump. It moves blood by squeezing and relaxing. There are 4 chambers and each chamber has a valve. This keeps blood from moving backwards when the heart squeezes. When a chamber squeezes it lets the blood move forward but when the chamber is relaxed it prevents the blood from leaking back into it.
Dr. Robert Binford reviewed this
40 year experience in Thoracic Surgery
How long it usually lasts:
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