NEET Zoology Cardiac Cycle MCQ Question
Which of the following combinations correctly describes aspects of the cardiac cycle?
A. The atrioventricular valves open when the atrial pressure exceeds ventricular pressure. B. The semilunar valves close to prevent backflow into the ventricles during ventricular diastole.
A. The semilunar valves are always open during ventricular contraction. B. The atrioventricular valves close when the ventricular pressure is lower than atrial pressure.
A. During ventricular diastole, the atrioventricular valves close to prevent blood from flowing back into the atria. B. The ventricles contract when the atrial pressure is higher than ventricular pressure.
A. The semilunar valves open when ventricular pressure exceeds aortic pressure. B. Atrial contraction occurs after ventricular contraction.
Correct Answer
Detailed Explanation
The first option correctly states that the atrioventricular valves open when atrial pressure exceeds ventricular pressure and that the semilunar valves close to prevent backflow into the ventricles during diastole, as described in the NCERT context.
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