Q 1525378261.     Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

AIPMT 2015
A

AV node receives signal from SA node.

B

AV valves open up.

C

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

D

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

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