The loudest sound you hear through a stethoscope while listening to your heart is
A)the contraction of the ventricles.
B)the relaxation of the ventricles.
C)the AV valves closing.
D)the semilunar valves closing.
E)the depolarization of the ventricles.

Question

Quizplus · Accepted Answer

The loudest sound heard through a stethoscope is the "lub" sound, which is caused by the closing of the atrioventricular (AV) valves (mitral and tricuspid valves) at the beginning of ventricular contraction (systole).

The Loudest Sound You Hear Through a Stethoscope While Listening