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3-3-08 anatomy notes

3-3-08 anatomy notes - anatomy notes 1 Circulatory System a...

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3-1-08 anatomy notes 1. Circulatory System a. Cardiac Physiology i. Blood Vessels 1. General Structure a. Tunica Adventitia (externa)-white fibrous connective tissue (outermost layer) b. Tunica Media-smooth muscle only (middle layer) c. Tunica Intima-endothelium (innermost layer; a single cell layer which is very smooth to help prevent cardiovascular blood clots) 2. Types a. Elastic Arterioles-aorta, brachiocephalic, common carotids, subclavian, common iliacs, pulmonary trunk & arteries- contain elastic connective tissue in walls b. Muscular Arteries-external & internal carotids, axillary, brachial, subscapular, radial, ulnar, external & internal iliacs, femoral & deep femoral c. Arterioles-diameter smaller than muscular arteries; have a tunica media and can be present as smooth muscle (separate rings and amount present is reduced compared to arteries) d. Metarterioles-directly connect arterioles to venules e. Capillaries-microscopic; NO tunica adventitia or tunica media present; single layer of endothelial cells (tunica intima) 1. Form from arterioles ii. Continuous-MOST common iii.
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