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

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. A V node receives signal from SA nodeB. AV valves open upC. Ventricular walls vibrate due to gushing in of blood from atriaD. Semilunar valves close down after the blood flows into vessels from ventricles
Answer» Correct Answer - D Closure of Bicuspid & tricuspid valve produces first heart sound (lubb) while of semilunar valve produces second heart sound (Dup).

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