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Heart Valves Are In What State During Isovolumetric Contraction?

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Isovolumetric contraction is the brief period of time at the beginning of ventricular systole where both the AV valves and semilunar valves are closed. Because these closed valves prevent blood from exiting the ventricles, the volume of the ventricles stays the same despite contraction of the heart muscle. This period of contraction is quite brief - lasting less than 20 msec or about 2 percent of the full cardiac cycle.

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