Tunica Interna: Cells fit closely together forming a very slick surface to decrease friction of blood flow, Innermost layer that lines the lumen (inside) of the blood vessels, Thin layer of endothelium (stratified squamous epithelium), Tunica Media: Bulky middle layer of muscle, Composed of smooth muscle and elastic fibers, May constrict and dilate under the control of the sympathetic nervous system to control blood pressure, Tunica Externa : Composed of fibrous connective tissue, Functions to support and protect the blood vessels with its durable connective tissue, Outermost layer,

Tunics of Blood Vessels (#7 on wksht)

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