Time interval between the closure of semilunar valve and closure of AV Value is
(1) 0.3 s        (2)  0.1 s 
(3) 0.5 s        (4)  0.7 s
Explain it   

Dear Student.
Please find below the solution to the asked query.

The correct answer is 4. 0.7 s.
There are two atrioventricular (AV) valves, the mitral valve (bicuspid valve), and the tricuspid valve
There are two semilunar (SV) valve: the aortic valve and the pulmonary valve.

Mitral valve and the aortic valve are present in the left side of heart. Tricuspid valve and the pulmonary valve are present in the right side of heart. The closure of the AV valves makes a sound as lub. The closure of the SL valves makes a sound known as dub.

Between the time frame of "lub" and "DUB," blood is pumped from heart to circulatory system.

This time frame varies in adults and children. Moreover also depends on number of heart beats. More the heart beats/minute, lesser is the time between lub and DUB. The average time is 0.7-0.8 sec.

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