BIOL 2P97 Lecture 12: BIOL 2P97 12

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Because blood pressure is pulsatile, its helpful to represent arterial pressure as a single value. This represents the driving pressure of blood how well blood can flow through the circulatory system. Diastole lasts twice as long as systole and therefore contributes twice as much to the average/mean pressure. Map is the driving force for blood flow. Balance of: flow into + out of the arteries. Blood flow into arteries depends on cardiac output. Blood flow out of arteries depends on resistance in the arterioles. Anything that changes flow into arteries (changes in cardiac output) or anything that changes flow out of arteries (resistance in arterioles) will change mean arterial pressure. Map varies directly with: cardiac output and resistancearterioles. The more fluid you have, the higher map, so your cardiac output increases. Ex. if flow into arteries is greater than flow out of arteries, map will increase. This is one of the determinants of map.

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