Is the ventricle lumen larger during systole or during diastole?

Is the ventricle lumen larger during systole or during diastole?
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Systole is the stage of the cardiac cycle on which the ventricles contract. So the lumen of these chambers is reduced and the pressure upon the blood within them is heightened. During diastole the opposite occurs. The muscle fibers of the ventricles relax and the lumen of these chambers enlarges helping the entrance of blood.
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