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What do capillaries do and what are they composed of? -Associated with gas, fluid, metabolite, and nutrient exchange -Composed of endothelial cells, basement membrane, and occasional pericytes
Continuous Capillaries -no interruption of lining -found in fat, muscle, and nervous system
Fenestrated capillaries -contain pores with diaphragm for high capacity exchange -found in small intestine, kidney, and endocrine glands
Discontinuous capillaries -large gaps between endothelial cells -found in sinusoids of liver, bone marrow, and spleen
Pericyte -contractile cells that wrap around the endothelial cells of capillaries and venules throughout the body. -embedded in basement membrane where they communicate with endothelial cells of the body's smallest blood vessels
How do postcapillary venules differ from capillaries? -Greater diameter and more pericytes than capillaries -Where white blood cells enter and leave vascular system
arteriovenous shunt -direct connection between arteriole and venule
Important functions of epithelium -Permeability barrier between the blood and tissues -Make collagen/proteoglycans for basement membrane maintenance -Control blood flow by regulating the diameter -Non-adhesive surface -Adhesion molecules, Interleukins, and Growth Factors
What is significant of a Vein with a valve? What is it? a projection of the tunica intima of the vein wall in veins larger than 2mm, and is composed of fibroelastic tissue.
What kind of drainage do lymphatic vessels do? Passive
Created by: brittvac