Test Academy | A stethoscope is used by doctors for cardiac auscultation. The second sound of each cardiac cycle is heard when AV node receives signal from SA node, Semilunar valves close down after the blood flows into vessels from ventricles, AV valves open up, Ventricular walls vibrate due to gushing in of blood from atria

Question

A stethoscope is used by doctors for cardiac auscultation. The second sound of each cardiac cycle is heard when

Options :