What do semilunar valves prevent?
A) Semilunar valves prevent the flow of blood into the ventricles during atrial contraction.
B) Semilunar valves prevent backflow of blood into the atria.
C) Semilunar valves prevent backflow of blood into the ventricles.
D) Semilunar valves prevent backflow of blood into the veins.
E) Semilunar valves prevent backflow of blood into the coronary vasculature.
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