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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

(a) AV node receives signal from SA node

B

(b) AV valves open up

C

(c) Ventricular walls vibrate due to gushing of blood from atria

D

(d) Semilunar valves close after the blood flows into vessels from ventricles

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