During exercise in physiological limits what is the effect on end systolic volume?
(A) ESV decreases (B) ESV increase (C) ESV remain unchanged (D) ESV first decrease and then increases
(A) During exercise, there is increased sympathetic discharge and venous return to hea. This causes increased stroke volume mainly due to increased myocardial contractility. Due to increased stroke volume, the ESV decreases. In the image given the stoke volume is indicated by the width of the loop and LV pressure by the height of the loop. Three major effects occurring during exercise are : Sympathetic nervous system activation in many tissues with stimulatory effects on circulation. Increase in aerial pressure Increase in cardiac output.