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Q.

The second heart sound dub is due to

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a

closure of atrioventricular valves during ventricular systole

b

closure of semilunar valves during ventricular systole

c

closure of semilunar valves during joint diastole

d

opening of semilunar valves during joint diastole

answer is C.

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Detailed Solution

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Dub sound or second sound(S2) is caused by blood turbulence associated with closure of the SL valves at the beginning of ventricular diastole.

Lubb sound or first sound(S1) is caused by blood turbulence associated with closure of the AV valves soon after ventricular systole begins.

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