Doctors use stethoscope to hear the sounds produced during each c… - Vidyadip

MCQ

Doctors use stethoscope to hear the sounds 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 in of blood from atria
✓
Semilunar valves close down after the blood flows into vessels from ventricles.

✓

Answer

Correct option: D.

Semilunar valves close down after the blood flows into vessels from ventricles.

d
(d) : Second heart sound $i.e.$, dup is caused by the closure of the semilunar values and marks the end of ventricular systole.

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