The time between mitral valve closure and aortic valve opening is called the isovolumic contraction phase of the cardiac cycle.

Name: The time between mitral valve closure and aortic valve opening is called the isovolumic contraction phase of the cardiac cycle.
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The isovolumic contraction phase occurs after mitral valve closure and before aortic valve opening, during which the ventricles contract with no change in volume (hence "isovolumic").

The Time Between Mitral Valve Closure and Aortic Valve Opening