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 semilunar valves is triggered by the pressure in the atria exceeding the pressure in the ventricles.
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
During ventricular diastole, the semilunar valves close due to a fall in ventricular pressure, not because of atrial pressure. This prevents backflow into the ventricles.
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