Zoology-Cardiac Cycle
NEET Zoology Cardiac Cycle MCQ Question
Type: MCQ-fact-Hard-Class 11
What causes the closure of the semilunar valves during the cardiac cycle?
A
A decrease in ventricular pressure
B
An increase in atrial pressure
C
A contraction of the atria
D
The backflow of blood into the ventricles
Correct Answer
Option A
Detailed Explanation
The closure of the semilunar valves occurs as the ventricular pressure falls during ventricular diastole, preventing the backflow of blood into the ventricles.
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