NEET Zoology Cardiac Cycle Assertion Reason Question
Assertion (A): During ventricular diastole, the semilunar valves close to prevent backflow of blood into the ventricles.
Reason (R): The closure of the semilunar valves occurs because the pressure in the ventricles becomes lower than the pressure in the pulmonary artery and aorta.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
Both statements are true and the reason correctly explains the assertion as stated in the NCERT context that the closure of semilunar valves prevents backflow when ventricular pressure falls.
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