Starling's Law or the Frank-Starling Law of the heart.

stroke volume, end-diastolic volume, and contraction strength

Frank-Starling's law of the heart states that the stroke volume of the heart increases in response to an increase in the volume of blood received by the heart during diastole. This relationship helps to maintain cardiac output and ensure adequate blood flow to meet the body's demands.

Frank Starling's law of the heart refers to a length-tension relationship of cardiac muscle cells. As ventricles fill with blood, the extra blood causes a stretch of the muscle cells known as end diastolic volume. The greater the stretch, within limits, the greater the contractile force, and therefore the greater the ability to eject blood from the ventricles (end systolic volume) to the great vessels, pulmonary trunk or aorta.