how does valves prevents from backward flow of blood
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The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps (leaflets), except the mitral valve. It only has 2 flaps.
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The valves of the heart are located within the chambers of the heart. It prevents the backflow of the blood. The opening and closing functions of the valves are controlled by pressure differences generated within the heart, as well as some muscles located within the heart.
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