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Doctors use stethoscope to hear the soun...

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

A

Ventricular walls vibrate due to pushing in of blood from atria

B

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

C

AV node receives signal from SA Node

D

AV valves open up

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Verified by Experts

The correct Answer is:
B
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