Which of the following describes the effect of end-diastolicvolume on stroke volume?

		A decrease in end-diastolic volume allows cardiac muscle torelax, conserving energy for the next contraction, therebyincreasing stroke volume of that next contraction.
		A decrease in end-diastolic volume allows ventricular musclecells to relax more during diastole, allowing more blood to returnto the heart increasing stroke volume.
		An increase in end-diastolic volume stretches ventricular musclecells to lengths greater than optimum, decreasing the strength ofcontraction and thereby decreasing stroke volume.
		An increase in end-diastolic volume stretches ventricular musclecells to lengths closer to optimum, increasing the strength ofcontraction and thereby increasing stroke volume.
		A decrease in end-diastolic volume creates a vacuum drawing moreblood into the ventricle increasing stroke volume.