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Q.

The first heart sound (lub) is produced when 

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a

the ejection of blood from the left ventricle into the aorta ends

b

atrioventricular valves close soon after ventricular systole begins

c

an action potential propagates from the AV node to the SA node

d

semilunar valves close soon after joint diastole begins

answer is B.

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Detailed Solution

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves at the beginning of ventricular systole.

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