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Q.

Which of the following cardiac events occur during ventricular systole?

a.   Opening of bicuspid and tricuspid valves

b.   Closure of bicuspid and tricuspid valves

c.   Opening of semilunar valves

d.  Closure of semilunar valves

e.   Lubb sound

f.   Dupp sound

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a

a, c and e

b

a, d and f

c

b, d and f

d

b, c and e

answer is B.

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Detailed Solution

During ventricular systole, atrioventricular valves close and semilunar valves open. The closure of AV valves produces lubb sound. Closure of semilunar valves, opening of AV valves and dub sound occur during ventricular diastole.

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