Identical twins ride bicycles side by side reaching the top of a hill at the same time.
One is taking drugs that block the beta-receptors. None of the above. Following administration of an experimental drug, a patient experiences an episode of marked and sustained increase in total peripheral resistance with no change in venous return, heart rate or contractility. No change in left ventricular end systolic pressure 9. Stroke volume is the volume of blood each ventricle of the heart ejects per beat.