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A member asked:
What is the definition or description of: valve?
A doctor has provided 1 answer
See below: 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.
Answered 12/5/2012
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