Which factor below does not affect stroke volume?

Question

Quizplus · Accepted Answer

Preload is the amount of tension in the myocardium of the ventricular walls. If the walls have been stretched by the amount of blood entering, the ventricles will contract more forcibly. This follows the Frank-Starling law of the heart, which says the heart must pump out the amount of blood it receives. Contractility refers to the responsiveness of the cardiac muscle to contract. Afterload concerns the pressure in the pulmonary trunk and aorta during diastole.

Which Factor Below Does Not Affect Stroke Volume