Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard whenA. Ventricular walls vibrate due to gushing in of blood from atriaB. Semilunar valves close down after the blood flows into vessels from ventriclesC. AV node receives signal from SA nodeD. AV valves open up

Doctors use stethoscope to hear the sounds produced during each cardia

1.	Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard whenA. Ventricular walls vibrate due to gushing in of blood from atriaB. Semilunar valves close down after the blood flows into vessels from ventriclesC. AV node receives signal from SA nodeD. AV valves open up
Answer» Correct Answer - B Doctors used stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when semilunar valves close down after the blood flows into vessels from ventricles.

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