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Doctors use stethoscope to hear the soun...

Doctors use stethoscope to hear the sounds prodoced during each cardiac cycle. The sec- ond sound is heard when

A

AV valves open up

B

ventricular walls vibrate due to gushing in of blood from atria

C

semilunar valves close down after the blood flows into vessels from ventricles

D

AV node receives signal from SA node

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) In healthy adults, there are two normal heart sounds often described as lub and dup. These are the first heart sound and second heart sound produced by the closing of the AV valves and semilunar valves respectively.
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