The semilunar valves prevent the backflowing of blood into the

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atria

ventricles

arota

pulmonary trunk

answer is B.

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Detailed Solution

The aortic and pulmonary valves are known as the semilunar valves because they are made up of three crescent moon–shaped cusps each. The semilunar valves allow ejection of blood from the heart into arteries but prevent backflow of blood into the ventricles.

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