Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A): Ventricular filling occurs even before atrial systole.
Reason (R): During joint diastole, as the ventricular pressure declines, AV valves are forced open by the pressure exerted by atrial blood.
In light of the above statements, choose the correct answer from the options given below.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(A) is false but (R) is false

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

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

(A) is true but (R) is false

answer is A.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Both the assertion and the reason seem to be accurate in describing the cardiac cycle.

Assertion (A): Ventricular filling occurs even before atrial systole.

This is true. Ventricular filling begins during late diastole, even before atrial systole. The atria contract (atrial systole) to push the remaining blood into the ventricles, but ventricular filling starts earlier.

Reason (R): During joint diastole, as the ventricular pressure declines, AV valves are forced to open by the pressure exerted by atrial blood.

This is also correct. Joint diastole refers to the period when both atria and ventricles are in diastole. As ventricular pressure decreases, the atrioventricular (AV) valves are pushed open by the pressure from the incoming blood in the atria.
So, both the assertion and reason are accurate, and the reason explains why the assertion is true.

Watch 3-min video & get full concept clarity