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Solution


Q.

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when              [2015]
1 AV node receives signal from SA node  
2 AV valves open up  
3 Ventricular walls vibrate due to gushing in of blood from atria  
4 Semilunar valves close down after the blood flows into vessels from ventricles.  

Ans.

(4)

Second heart sound i.e., dup is caused by the closure of the semilunar valves and marks the end of ventricular systole.