Bio_1A_Lecture_16_Vessels - Structure of Blood Vessels...

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Structure of Blood Vessels AORTA ARTERY ARTERIOLE CAPILLARY VENULE VEIN VENA CAVA know these vessels!
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mm Hg 100 50 25 75 0 Functional activity of blood vessels is related to their ‘geometry’ total cross- sectional area velocity of blood flow blood pressure
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Functional activity of blood vessels Arteries - thick, strong walls Pressure: high; pulsatile Blood Flow: fast Arterioles - wrapped in smooth muscle Pressure: variable Blood Flow: variable Capillaries - extremely, extremely thin Pressure: low Blood Flow: slow Veins - flexible walls Pressure: low Blood Flow: fast
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Regulation of blood flow through the microcirculation (capillaries) (b.) Sphincters contracted (a.) Sphincters relaxed Regulation of sphincters, open or closed , is a function of local and neural factors. (constricted)
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Disturbances of fluid movement between capillaries and tissues could lead to serious disturbances in fluid balance (e.g., edema = swelling) Movement between capillaries and the interstitial fluid
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The “muscle pump” Blood flow in VEINS Valves are essential for return of blood from the lower extremities.
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Bio_1A_Lecture_16_Vessels - Structure of Blood Vessels...

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