The opening and closure of the atrioventricular and semilunar valves is driven by
A)contraction of muscles attached to the valves.
B)contraction of the ventricle and atria that pull the valves into place.
C)contraction and relaxation of the valve.
D)differences in pressure across the valve.
E)contraction of the valve.

Question

Quizplus · Accepted Answer

The opening and closure of the atrioventricular and semilunar valves are driven by differences in pressure across the valves. When the pressure is greater on one side of the valve, it opens, and when the pressure is greater on the opposite side, it closes.

The Opening and Closure of the Atrioventricular and Semilunar Valves