NEET Zoology Cardiac Cycle MCQ Question
Which of the following statements about the cardiac cycle is correct?
The closure of the semilunar valves occurs during ventricular diastole.
Blood flows from the atria to the ventricles when the ventricles are under high pressure.
The tricuspid and bicuspid valves close to prevent backflow into the atria during ventricular contraction.
Ventricular pressure increases as the semilunar valves open to allow blood flow into the arteries.
Correct Answer
Detailed Explanation
The closure of the semilunar valves prevents backflow during ventricular diastole when the ventricular pressure falls, as described in the context. Options B and C misrepresent the relationship between pressure and blood flow, while D correctly describes the situation but does not address valve closure.
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