Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion-(A): 70% of ventricular filling occurs during joint diastole of human cardiac cycle
Reason-(R): Declining ventricular pressure and increased atrial blood pressure due to atrial contraction causes opening of A-V valves during joint diastole.
In light of the above statements, choose the correct answer from the options given below.

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

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

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

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

answer is D.

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Detailed Solution

Passive filling (70%) of ventricles occurs in joint diastole. A-V valves open due to declining ventricular pressure. The pressure exerted by the blood which fills the atria.

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