BIOL 1080 Study Guide - Midterm Guide: Angiotensin, Baroreceptor, Orthostatic Intolerance
Document Summary
Lecture 12: part 2 regulation of blood pressure. Pressure is the driving force for blood flow: vena cava pressure is 0 mm hg and aortic pressure is 85 mm hg, change in pressure is 85 mm hg. Flow = pressure / resistance in physics. Co = map / tpr in bio: co = cardiac output (flow, map = mean arterial pressure (p, tpr = total peripheral resistance (r) combined resistance of all blood vessels in within the systemic circuit. Systolic blood pressure maximum pressure: when the ventricles contract, sending blood into the arteries. Diastolic blood pressure minimum pressure: when the heart relaxes between beats not zero due to elastic recoil of arterial wall. The measured bp is shown as sp/dp (120/80) Map = 1/3(sp) + 2/3(dp) for resting body. Arterioles are the prime controllers of blood pressure main sight of trp regulation: vasoconstriction (smooth muscle contraction, decrease radius, increase resistance, vasodilation (smooth muscle relaxation)
