Opening of the semilunar valves occurs when which of the following occurs?
A) The pressures in the arteries exceed those in the ventricles.
B) The pressures in the atria exceed those in the ventricles.
C) The pressures in the ventricles exceed those in the aorta and pulmonary artery.
D) The pressures in the ventricles exceed those in the atria.
Correct Answer:
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