BIOM 3200 Chapter 13-14: Unit 9
11 Jun 2016
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B/d leaves the heart by passing through arteries, arterioles and capillaries. 1) the innermost layer is endothelium which lines the lumina of all b/d vessels. 2) the basement membrane (a layer of glycoproteins) overlying some connective tissue fibers. 3) a layer of elastic fibers/elastin, form an internal elastic lamina. Arteries have more muscle then veins, which give them more of a rounder looking in across section. Also referred to as the resistance vessels of the cardiovascular system b/c they have a relatively strong, resilient tissue structure that resists high blood pressure. The large elastic arteries expand when the pressure of the (cid:271)/d (cid:396)ises as a (cid:396)esult of the (cid:448)e(cid:374)t(cid:396)i(cid:272)les(cid:859) (cid:272)o(cid:374)t(cid:396)a(cid:272)tio(cid:374) They have a recoil like a rubber band when the b/d pressure falls during relaxation of the ventricles. The elastic recoil drives the b/d during the diastolic phase (longest phase)when the heart is resting and not providing a driving pressure.
