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Chapter 20 Blood vessels - Impaired valve function Standing...

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8/16/2010 1 Blood vessels Chapter 20 The vessels: background Highways for blood 60,000 miles Blood vessels Arteries Arterioles Capillaries Venules Veins Blood vessels Structure permits Blood flow Molecular exchange between blood and tissues Blood vessels 3 layers Tunica externa: loose connective Tunica media: smooth muscle Tunica interna: simple squamous Arteries Large (elastic ) Elastic fibers in tunica media Changes in diameter Medium (muscular ) Less elastic fibers & more smooth muscle in tunica media Fairly constant diameter Arteriole Poorly defined tunica externa & media Veins Large Thickest layers (compared to other veins) Medium Tunica media thin Venule No tunica media Venous valves BP in veins too low to overcome gravity Prevent backward flow away from the heart Skeletal muscle pump Varicose veins Dilated, swollen, painful veins
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Unformatted text preview: Impaired valve function Standing, inactivity Capillaries 1 2 3 4 5 6 7 8 9 10 11 8/16/2010 2 Continuous Complete endothelial lining Fenestrated Perforated endothelial lining Sinusoidal Most perforated Special capillaries: low-permeability Blood brain barrier Prevents all but most vital molecules from entering the brain The systemic circulation Be familiar with the arteries and veins taught in lab Special vessels Aorta Largest artery Great saphenous vein Longest vein Special vessels: The hepatic portal system Hepatic = liver Portal = connecting two capillary beds Digestive organs Sinusoids of liver Nutrient rich, deoxygenated blood Processing Storage Hepatic portal system The hepatic portal system 12 13 14 15 16 17...
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