BIOL 031 Lecture Notes - Lecture 5: Parasympathetic Nervous System, Sympathetic Nervous System, Hydrostatics
17 May 2020
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Document Summary
Sympathetic nervous system: responsible for dangerous activities in body, can rescue someone whose heart is failing. Hydrostatic pressure pressure exerted by fluid on the walls of a container. Pressure falls with distance as energy is lost to friction. Overall flow is proportional to the difference of the pressure in the afferent and efferent side. Flow rate volume of fluid per unit time. Velocity changes as a function of cross sectional area. Velocity = flow rate / cross sectional area (a) Can change flow velocity without changing flow rate. Aorta and arteries very elastic like rubber band, expand and contract back. Elasticity and recoil of arteries maintains blood flow. Pulse pressure = systolic pressure diastolic pressure. Mean arterial pressure = dp + 1/3 pp. Spend 2/3 time in diastole and 1/3 time in systole. Dp + 1/3 (sp dp) 2/3 dp + 1/3 sp. Mean arterial pressure proportional to cardiac output (stroke volume and heart rate) x peripheral resistance.
