Question
Opening of the semilunar valve takes place during which phase of the cardiac cycle?
Show Answer
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Correct Answer » C
Explanation
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Ans:C. C.
Ventricular Ejection is shown in phase C
- At end of ventricular contraction, pressures in left and right ventricles exceed pressures in aorta and pulmonary artery.
- At this stage, Aortic and pulmonary valves open.
- When the aortic and pulmonary valves open, the phase of ventricular ejection begins.
- Ejection is rapid at first, slowing down as systole progresses.
- The intraventricular pressure rises to a maximum and then declines somewhat before ventricular
- Peak pressures in the left and right ventricles are about 120 and 25 mm Hg, respectively
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