At what point does isovolumetric relaxation conclude?

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When the atrioventricular valve shutsOnce ventricular pressure drops below the pressure in the aortaAs soon as ventricular pressure decreases beneath atrial pressureNone of these choices

Explanation

Isovolumetric relaxation ends when the ventricular pressure falls below the atrial pressure, allowing the atrioventricular valve to open and ventricular filling to begin.