Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:
Held on 30 Apr 2015 · Verified 9 Jul 2026.
Ventricular walls vibrate due to gushing in of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles
AV node receives signal from SA node
AV valves open up
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Work through every NEET UG Body Fluids and Circulation PYQ, year by year.