All the heart valves are open during which stage of cardiac cycle __________________?
Correct answer: B. None of the above
- A. Systolic ejection
- B. None of the above
- C. Isovolumetric contraction
- D. Isovolumetric relaxation
Explanation
During systole or diastole, pressure differences keep either the atrioventricular or semilunar valves closed; during isovolumetric phases, all valves are closed. Thus, no stage of the normal cardiac cycle has all valves open.
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