BIOL 2160 Chapter : Chapter 14

• School: LSU
• Department: Biological Sciences
• Course: BIOL 2160
• Professor: All

Document Summary

Flow rule: circulatory system , pressure = force, flow occurs from. Pressure gradient across systemic circuit: highest= pressure in aorta = mean arterial pressure (map) = 90 mmhg, lowest= pressure in vena cava = central venous pressure (cvp) = 0 mmhg. Pressures and pressure drops in the pulmonary and systemic circuits 14. 3: know how to interpret, note lower resistance in pulmonary circuit: left ventricle only goes to the lungs, greatest drop in the arteriols. Resistance in the cardiovascular system: pressure gradient in systemic circuit much greater, flow through both circuits equal, flow = p/r, resistance through pulmonary circuit much. Factors affecting resistance to flow: radius of vessel, in arterioles (and small arteries) - can regulate radius, wrapped in smooth muscle, length of vessel, viscosity of fluid = , blood viscosity dependent on amount of rbcs and proteins. Regulate blood flow by regulating: regulation of radius of arterioles (and small arteries, vasoconstriction, decrease radius increase resistance, vasodilation, increase radius decrease resistance.