Physiology General 4b8457ec Volume determining preload is: A End diastolic volume of ventricles B Endo systolic volume C Volume of blood in aoa D Ventricular ejection volume High-Yield Explanation A i.e End diastolic volume of ventricles According to frank-starling law, the length of muscle fibers (extent of the pre-load) is propoionate to the end diastolic volumeQ