Q.

Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).

Assertion (A): ‘Dub’ sound is produced during joint diastole.

Reason (R): Bicuspid and tricuspid valves open during joint diastole.

In light of the above statements, choose the correct answer from the options given below.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A).

b

Both (A) and (R) are false.

c

(A) is true but (R) is false.

d

Both (A) and (R) are true and (R) is not the correct explanation of (A).

answer is B.

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Detailed Solution

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Dub sound is produced during joint diastole due to the closure of semilunar valves but not due to the opening of bicuspid and tricuspid valves.

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