Body Fluids And Circulation Ques 57

57. Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:

[2015 RS]

(a) Ventricular wall vibrate due to gushing in of blood from atria.

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

(c) AV node receives signal from $SA$ node.

(d) AV valves open up.

Show Answer

Answer : b

Hints & Solutions

(b) The second sound heard by doctors using stethoscope occurs when semilunar valves close down after the blood flows into vessels from ventricles.

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