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

Question

Quizplus · Accepted Answer

The opening and closure of the atrioventricular and semilunar valves in the heart are primarily driven by differences in pressure across the valves. When the pressure is greater on one side of the valve, it forces the valve open, and when the pressure is greater on the other side, it forces the valve closed. This mechanism ensures unidirectional blood flow through the heart.

The Opening and Closure of the Atrioventricular and Semilunar Valves