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5 Cards in this Set

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arteries: how many layers-and functions
3
1st contains eleastic fibers
2nd or middle- contracts to regulate blood flow and blood presure

3rd-contains fiberouse conective tissue-and it becoms loose at its periphery
arterioles??
function??
small arteries
middle layer has some eleastic tissue bunt mainly composed of smooth muscle.

if contracted or dialated affects blood pressure- the great the number of vessels dialated the lower the blood presure
capillaries???
function??
arteriols branch into capillaries
-exteamly narrow, microscopic tube- one cell thick wall

exgange of oxygen, nutrients, glucose diffuses though there walls
capillary beds
netwok of many capillaries
when do capillaries open
after eating-digestive capillaries- the muscle capillaries close