<unk>  is the<unk>  that must be overcome to push blood through the circulatory system and create flow. The<unk>  offered by the systemic circulation is known as the systemic<unk>  (SVR) or may sometimes be called by the older term total peripheral<unk>  (TPR), while the<unk>  offered by the pulmonary circulation is known as the pulmonary<unk>  (PVR). Systemic<unk>  is used in calculations of blood pressure, blood flow, and cardiac function. Vasoconstriction (i.e., decrease in blood vessel diameter) increases SVR, whereas vasodilation (increase in diameter) decreases SVR.
Vascular resistance
Coronary perfusion pressure
Renal threshold
Arterial input function
Vagal tone
Critical closing pressure
Cardiac output
Diffusing capacity