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Doctors use stethoscope to hear the soun...

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

A

AV node receives signal from SA node

B

AV valves open up

C

Ventricular walls vibrate due to gushing of blood from atria

D

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

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