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Class 11 NEET Biology Body Fluids and Circulation

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Question : 33

Total: 106

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

AV node receives signal from SA node
AV valves open up
Ventricular walls vibrate due to gushing in of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles.

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