BIOL 1119 Lecture 9: Lecture 9 Blood flow CO
19 Aug 2016
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Blood pressure, flow, and cardiac output: lecture 9. Mean arterial pressure = cardiac output x total peripheral resistance. Map = cardiac output (co) x total peripheral resistance (tpr) F (delta)p/r; (delta)p = f x r. Tpr is basically equal to total arteriolar resistance: As long as tpr is maintained (for a given co), then map is constant. Decrease r in one area by dilating arterioles in that area. While increasing r in another area(s) by constricting arterioles in other area(s) Blood flow to other areas does not change: brain compensatory changes in arteriolar resistance occur to maintain the. ^to the brain and other appropriate organs or tissues. If resistance in one area has to decrease dramatically in order for flow in that area to increase dramatically (ex. exercise) Then, holding map constant helps hold local bp constant: helps hold local flow constant.
