Which event takes place immediately after the aortic valve closes?

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Phase of muscle contraction with no volume changePhase of muscle relaxation with constant volumePeriod just before the heart fills with bloodPeriod just before the heart contractsNone of the above

Explanation

The aortic valve closes at the start of the isovolumetric relaxation phase, which is when the ventricles relax but the volume remains unchanged because all valves are closed.