ANATOMY

Detailed explanation-1: -During exercise, your heart typically beats faster so that more blood gets out to your body. Your heart can also increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps.

Detailed explanation-2: -Typically, stroke volume increases sharply at exercise onset up to around 40% consequent to increased blood volume, venous return, and filling pressures according to the Frank–Starling mechanism.

Detailed explanation-3: -Increasing the contractility of the heart which occurs, for example, during exercise generally increases the stroke volume.

Detailed explanation-4: -The stroke volume increases because of increased ventricular contractility, manifested by an increased ejection fraction and mediated by sympathetic nerves to the ventricular myocardium.

Detailed explanation-5: -During exercise, more blood is sent to the active skeletal muscles, and, as body temperature increases, more blood is sent to the skin. This process is accomplished both by the increase in cardiac output and by the redistribution of blood flow away from areas of low demand, such as the splanch-nic organs.