Heart sounds

2015 AIPMT-II 1 question

1. 1 Body Fluids and Circulation
   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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