Is the ventricle lumen bigger in systole

Is the ventricle lumen bigger in systole or for the period of diastole?

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Systole is the phase of cardiac cycle on which the ventricles contract. Therefore the lumen of such chambers is decreased and the pressure on the blood in them is heightened.

Throughout diastole the opposite takes place. The muscle fibers of ventricles relax and the lumen of such chambers enlarges helping the entrance of blood.

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