BIOS 3430 Lecture Notes - Lecture 17: Exocytosis, Transcytosis, Pulse Pressure
21 Nov 2016
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Why: open circulatory system: blood or hemolymph are circulated slowly, bathes tissues freely. Example crayfish, locust, all of blood appears blue lecture 25. Lect 25 slide 6-20: flow: movement of blood is controlled primarily by the heart. Blood flow is measured as cardiac output or q (volume pumped per unit time. Flow is calculated by q = v x f, where q is flow, v is stroke volume, f is frequency of heart beat in beats/min. Volume (before contraction) and end-systolic volume (at the end of contraction). Sv varies with heart rate, pressures in atria, ventricles, aorta, etc. In the average human, v=70mls, f= 52 beats/min, so cardiac output (q)= Note that flow remains equal when viewed collectively in all compartments (aorta, capillaries, veins: pressure: hydrostatic pressure (unit mmhg, torr, pa) is the force exerted against wall or the pressure in fluid which is in motion.
