Ventricular systole. Red arrow is path from left ventricle to aorta.<unk>  is largely dependent upon aortic pressure.<unk>  is the pressure that the heart must work against to eject blood during systole (ventricular contraction).<unk>  is proportional to the average arterial pressure. As aortic and pulmonary pressures increase, the<unk>  increases on the left and right ventricles respectively.<unk>  changes to adapt to the continually changing demands on an animal's cardiovascular system.<unk>  is proportional to mean systolic blood pressure and is measured in millimeters of mercury (mm Hg).
Afterload
Purkinje effect
Renal threshold
Myogenic tone
Solvent drag
Contrast resolution
Vagal tone
Coronary reflex