Physiology of Circulation

Physiology of Circulation - Physiology of Circulation Blood...

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Physiology of Circulation Blood Flow: volume of blood flowing through a vessel, organ, or circulation in a given period (ml/min) Blood Pressure : pressure (force per unit area) exerted on the walls of a vessel by blood Resistance : opposition to blood flow (friction) - peripheral resistance (PR) : resistance in systemic circulation; contributed by: o Blood viscosity : thickness of blood (high viscosity in polycythemia; low viscosity in anemia) more viscosity = greater resistance o Blood vessel length : longer vessel length = greater resistance o Blood vessel diameter : most likely to alter resistance smooth muscle fibers control blood vessel diameter decreased diameter = greater resistance Systemic Blood Pressure: Blood pressure = cardiac output x peripheral resistance - Arterial Blood Pressure : o Systolic pressure : pressure generated in aorta following (left) ventricular systole (~120 mm Hg) o Diastolic pressure : pressure in aorta following ventricular diastole (70-80 mm Hg)
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Physiology of Circulation - Physiology of Circulation Blood...

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