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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

AV valves open up

B

Ventricular walls vibrate due to gushing in of blood from atria.

C

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

D

AV node receives signal from SA node

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The correct Answer is:
C
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