MedaferaIn which phase of the cardiac cycle does pressure rise while volume stays constant?
waitingYou saidRapid ejectionAnswerIsovolumetric contraction
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The Cardiac Cycle6:12 / 28:45
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Physiology · Cardiac Cycle
What causes S1?
Closure of the mitral and tricuspid valves at the start of systole.
From the lecture21:45
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1
In which phase of the cardiac cycle does pressure rise while volume stays constant?
Why
All four valves are closed: no blood enters or leaves, so the ventricle contracts on a fixed volume and pressure rises.
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Why does pressure rise if the volume doesn't change?
Because at that moment all four valves are shut. The ventricle squeezes a fixed amount of blood with nowhere to go, so pressure climbs fast until it beats aortic pressure and opens the aortic valve.
Said in the lecture at6:12
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S2 is caused by the closure of which valves?
right onceYou saidAV valvesAnswerSemilunar valves
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Assiut University · Second year
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Principles of Medical Sciences (PMS)
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