Cardiac cycle

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Last updated 5:08 AM on 4/11/26
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5 Terms

1
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1st step

atrial relaxation and ventricular filling: all chambers relaxed; passive filling of ventricles

2
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2nd step

Atrial contraction and ventricular filling: contraction of atria finished filling the ventricles

3
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3rd step

Isovolumic contraction: occurs at beginning og ventricular contract; AV valves forced closes (lubb heart sound)

4
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4th step

ventricular ejection: ventricles continue to contract and blood is ejected into arterial trunks

5
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5th step

isovolumic relaxation: occurs at beginning of ventricular relaxation, semilunar valves close (dupp heart sound)