why do the valves in the heart open only one way
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A heart valve is a one-way valve that normally allows blood to flow in only one direction through the heart. The four valves are commonly represented in a mammalian heart that determines the pathway of blood flow through the heart.
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The leaflets open to let blood move forward through the heart during half of the heartbeat. They close to keep blood from flowing backward during the other half of the heartbeat. The mitral valve has only two leaflets; the aortic, pulmonic and tricuspid valves have three
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