Looking for classes? Ksquare Career Institute, Bengaluru →
Doctors use stethoscope to hear the sound produced during each cardiac cycle. The second sound is heard when:
A
AV node receives signal from SA node
B
AV valves open up
C
Ventricular walls vibrate due to gushing of blood from atria
D
Semilunar valves close down after the blood flows into vessels from ventricles
