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Q.

The "lubb" sound (first heart sound) is caused by the 

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a

filling of the ventricles 

b

ventricular contraction

c

closing of the AV valves

d

closing of semilunar valves 

answer is C.

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Detailed Solution

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The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves (AV valves).

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