BIOB34H3 Lecture Notes - Tunica Intima, Tunica Externa, Vasa Vasorum

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20 Mar 2013
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Heart arteries arterioles capillaries venules veins heart. Anastomoses: most tissues receive blood from more than one artery, anastomoses are branches between arteries, also occur between veins, called collateral circulation (allows alternate pathways for blood flow) Smallest vessels, 3 10 m in diameter. Allow exchanges between blood and tissues: capillaries. Near almost all cells (epithelial sheets, cartilage, some parts of eye have none) Varying distribution based on need: e. g. , muscles, liver, kidneys, lungs, and nervous system have lots. Capillary beds: network of capillaries that feeds tissues, parts, terminal arteriole feeds bed, metarteriole, true capillaries (have precapillary sphincters that regulate blood flow, thoroughfare channel, postcapillary venule, veins. Venules: smallest are mostly endothelium (8 100 m diameter, larger ones have 3 tunics. Hepatic portal circulation: picks up nutrients absorbed from digestive tract and brings them to liver, liver processes and stores nutrients, breaks down toxins.

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