Cardiovascular+Physiology+fac+lecture

Cardiovascular+Physiology+fac+lecture - 125:315 BME...

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125:315 BME MEASUREMENTS AND ANALYSIS LABORATORY CARDIOVASCULAR PHYSIOLOGY Dr. Gary Drzewiecki
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The Cardiovascular System: Blood Vessels and Hemodynamics Structure and function of blood vessels Hemodynamics forces involved in circulating blood
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Anatomy of Blood Vessels Closed system of tubes that carries blood Arteries carry blood from heart to tissues elastic arteries muscular arteries arterioles Capillaries are thin enough to allow exchange Venules merge to form veins that bring blood back to the heart
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Arteries Tunica interna (intima) simple squamous epithelium known as endothelium basement membrane internal elastic lamina Tunica media circular smooth muscle & elastic fibers Tunica externa elastic & collagen fibers
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Elastic Arteries Largest-diameter arteries have lot of elastic fibers in tunica media Help propel blood onward despite ventricular relaxation (stretch and recoil -- pressure reservoir)
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Muscular Arteries Medium-sized/muscular arteries with more muscle than elastic fibers in tunica media Capable of greater vasoconstriction and vasodilation to adjust rate of flow All three layers in the wall are present
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Arterioles Small arteries delivering blood to capillaries tunica media containing few layers of muscle Metarterioles form branches into capillary bed to bypass capillary bed, precapillary sphincters close & blood flows out of bed in thoroughfare channel vasomotion is intermittent contraction & relaxation of sphincters that allow filling of capillary bed 5-10 times/minute
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Capillaries form Microcirculation Microscopic vessels that connect arterioles to venules Found near every cell in the body but more extensive in highly active tissue (muscles, liver, kidneys & brain) Function is exchange of nutrients & wastes between blood and tissue fluid Structure is single layer of simple squamous epithelium and its basement membrane
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Venules Small veins collecting blood from capillaries Tunica media contains only a few smooth
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This document was uploaded on 02/09/2012.

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Cardiovascular+Physiology+fac+lecture - 125:315 BME...

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