BIOS-1113 Study Guide - Quiz Guide: Tunica Intima, Simple Squamous Epithelium, Tunica Externa
7 Aug 2018
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Carry blood away from the heart transport it to tissues has all three tunics, highest velocity and pressure, vaso vasorum. Arterioles? have all 3 tunics, smooth muscle plays an important role in regulating the amount of blood flow to a tissue based on tissues energy need. Contains pre capillary sphincter that surrounds the metarterioles located at the entrance to the capillary bed regulating how much blood a capillary bed receives. Only compsed of t. intima, simple squamous epithelium,blood is at low velocity and speed, only vessels that permit exchange, high cross sectional area. Continuous capillaries? forms a continuous lining. located in muscle, ct , nervous system. Fenestrated capillaries? pores in cells. located in kidneys, intestine, endocrine glands. What are the layers of blood vessel wall? tunica externa (ct, collagen), tunica media (smooth muscle, regulates diameter of vessel), tunica intima (simple squamous epithelium, direct contact with blood, exchange)
