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 to prevent backflow into the ventricles.
The tricuspid and bicuspid valves close when the atrial pressure is higher than the ventricular pressure.
Blood flows from the atria to the ventricles only during ventricular systole.
The semilunar valves are forced open when ventricular pressure increases during atrial diastole.
Correct Answer
Detailed Explanation
Statement A is correct; the semilunar valves close during ventricular diastole to prevent backflow of blood into the ventricles. Statement B is incorrect because the tricuspid and bicuspid valves open when atrial pressure exceeds ventricular pressure. Statement C is misleading as blood flows into the ventricles during atrial systole. Statement D is incorrect as the semilunar valves open during ventricular systole, not atrial diastole.
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