What occurs during the time between the first heart sound and the second heart sound?
A)ventricular systole
B)ventricular diastole
C)ventricular filling
D)atrial systole
E)the P wave of the ECG

Question

Quizplus · Accepted Answer

The first heart sound (S1) is caused by the closure of the atrioventricular valves (mitral and tricuspid valves) and marks the beginning of systole, the period of contraction of the ventricles. The second heart sound (S2) is caused by the closure of the semilunar valves (pulmonary and aortic valves) and marks the end of systole, the period of contraction. Therefore, the time between S1 and S2 is the period of ventricular systole.

What Occurs During the Time Between the First Heart Sound