Nursing HAP201 Chapter Notes - Chapter 21: Common Iliac Artery, Internal Carotid Artery, Tunica Media
5 Mar 2017
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Hap201 week five/chapter 21 the cardiovascular system: blood vessels and hemodynamics. A group of these within a tissue reunite to form small veins called venules: venules merge to form progressively larger blood vessels called veins. It has three layers: endothelium: innermost layer continuous with the endocardial lining of the heart. These cells are active participants in vessel-related activities, e. g. physical influences on blood flow, secretion of locally acting chemical mediators that influence the contractile state of the vessel"s overlying smooth muscle and assistance with capillary permeability. They also reduce surface friction: basement membrane: second layer that provides physical support for the epithelial layer; anchors the endothelium to the underlying connective tissue while regulating molecular movement. It also guides cell movement during repair of blood vessel walls. Internal elastic lamina: outermost layer; forms boundary between the tunica interna and tunica media.
