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Lecture Ch. 19

Blood Vessels Part One

3 walls of blood vessles tunica intima, tunica media, & tunica externa
tissue of tunica intima endothelium-simple squamous epithelium
intima media made up of smooth muscle and elastic fibers. the smooth muscle is controlled by vasomotor nerves-sympathetic nerve fiers
tunic eterna (adventitia) made of connective tissue. it protects reinforce and anchors the vessel to surrounding structures
2.5 to 1 cm in diam. thick walled arteries near the heart. large amts of elastin and less smooth muscle for stretching and continuous blood flow...the conducting vessels elastic arteries
1 cm to .3 mm in diam. deliver blood to specific body organs...the distribution vessels muscular arteries
smallest arteries .3 mm to 10 micrometers in diam. responsible for the DISTRIBUTION of blood flow to different tissues...the resistance vessels arterioles
hardening or stiffening of arterial walls arteriosclerosis
fatty deposits w/in the arterial walls and causes arteriosclerosis atherosclerosis
average capillary length; average lumen diam 1 mm; 8-10 micrometers
capillary walls made of of tunica intima only
have no capillaries lens, cornea, cartilage, epithelial layers
allow passage of water and small solute particles intercellular clefts
pores fenestration esp where absorption and secretion occur
large lumens and allow passage of large solutes and some blood cells sinusoids
networks of capillaries w/in an organ or tissue capillary beds aka microciculation
rings on capillaries controlled by vasomotor nerves and local chemical factors and control the distribution flow precapillary sphincters
have a very thin tunica media and have thinner walls and larger lumens veins
the smallest veins are called venules
venous system contains about what % of the total blood volume 65%
venous valves provide one way flow of blood and found in the extremeities only T or F TRUE
stretched dilated veins caused by incompetent valves which are damaged by high venous pressures varicose veins
tunica intima only, supported by surrounding tissues venous sinuses
2 or more arteries supply the same area and are interconnected. provide collateral channels in case the primary artery is blocked; often occur around joints arterial anastamoses
provide alternate routes for blood to return to the heart venous anastamoses
Created by: 1671530535



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