Blood Flow Through Tissues

Blood Flow Through Tissues - Blood Flow Through Tissues...

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Blood Flow Through Tissues (tissue perfusion) - reasons exchange in lungs, absorption of nutrients from digestive tract, urine formation by kidneys - velocity of blood flow : velocity inversely proportional to diameter of blood vessel o aorta = 40-50 cm/s; capillary = ~ 0.03 cm/s; venae cavae = 10-30 cm/s - autoregulation : local regulation of blood flow o organs regulate blood flow by varying resistance of arterioles o metabolic controls : vasodilation by inflammatory mediators (histamine) or nitric oxide o myogenic controls : vasoconstriction & vasodilation by vascular smooth muscle to keep tissue perfusion constant despite pressure variations o increase blood flow or bypass occluded vessel Blood Flow Through Capillaries - vasomotion: slow blood flow through capillaries
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Blood Flow Through Tissues - Blood Flow Through Tissues...

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