The Vessel Wall - Cardiovascular System The Vessel Wall *...

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Cardiovascular System The Vessel Wall * Tunica intima (tunica interna)- inner layer that is exposed to blood * consists of a simple squamous endothelium overlaying a basement membrane and a sparse layer of fibrous c.t. * acts as a selectively permeable barrier to blood solutes * secretes vasoconstrictors and vasodilators * provides a smooth inner lining that repels blood cells and paltelets * platelets adhere to damaged endothelium * during inflammation, leukocytes adhere to endothelium by means of cell-adhesion molecules produced by the endothelium cells Arteries and Metarterioles * Arteries are constructed to withstand surges of blood pressure generated by the heart * more muscular than veins and appear relatively round in tissue sections * Arteries are divided into three categories by size * conducting (elastic) * distributing (muscular) * resistance (small) Arteries and Metarterioles * Conducting (elastic) arteries- * are the largest (pulmonary, aorta, common cartotids) * tunica media consist of lots of elastic tissue
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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The Vessel Wall - Cardiovascular System The Vessel Wall *...

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