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

Doctors use stethoscope to hear the sound produced 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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Practise Body Fluids and Circulation All 58 questions This chapter in 2015 AIPMT-II