Volume determining preload is:: (A) End diastolic volume of ventricles, (B) Endo systolic volume, (C) Volume of blood in aoa, (D) Ventricular ejection volume
Answer is A. 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