alleryVentricular systole closes the tricuspid and bicuspid valves because of:
AOpening of the semilunar valves
BRelaxation of both the ventricles
CAttempted backflow of blood into atria
DAn impulse from the vagus nerve
Answer & Solution
Correct answer: C. Attempted backflow of blood into atria
Rising ventricular pressure pushes blood back toward the atria, which snaps the atrioventricular valves shut.
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