What part of the the heart prevents blood from flowing backward through the heart?
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bicuspid (between left ventricle and atrium) and tricuspid (between right ventricle and atrium) are the 2 valves that prevent the backward flow of blood from the ventricles into the atria.

There are two semi-lunar valves also prevent the backward flow of blood from arota to the left ventricle (Aortic valve) and from the Pulmonary Artery to the right ventricle (the Pulmonary valve).

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First answer by Alaissham. Last edit by Anatomy James. Contributor trust: 16 [recommend contributor]. Question popularity: 14 [recommend question]

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