Preload and afterload are terms that encompass the amount of stretch and force that is required prior to contraction and during contraction, respectively Cardiac output is how much blood is exiting the aorta each minute

Stroke volume is the amount of blood that exits the left ventricle during systolic contraction The coronaries perfuse the myocardial tissue with oxygen-rich blood.

stroke volume — amount of blood pumped out of the left ventricle during systolic contraction. afterload — amount of pressure the heart needs to exert during ventricular contraction. cardiac output — number of liters of blood that exit the aorta in a minute. preload — initial stretch of the cardiac cells prior to contraction.