BIOL-2230 Lecture Notes - Lecture 10: Skeletal Muscle, Medulla Oblongata, Vascular Resistance
22 Feb 2017
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Document Summary
Arteries: thick walled vessels that carry blood away from the heart, details: Elastic arteries: large in diameter, close to the heart, thick walled, sheets of elastin in walls, some smooth muscle. Muscular arteries: further from heart, more smooth muscle than elastin, exit off of elastic arteries. Arterioles: come from arteries, connect to capillary beds. Capillaries: microscopic vessels that take blood from arteries to veins, sight of gaseous exchange, just the right size for 1 formed element at a time to pass through = increased transfer efficiency. Venules: capillaries empty into these, become veins. Veins: vessels that return blood to the heart, details: Tunica interna: deepest layer of a vessel wall, closest to lumen, blood vessel endothelium. Tunica media: smooth muscle layer, middle layer of vessel wall, can be affected by sympathetic nervous activity. Tunica externa: most superficial layer of vessel wall, composed of collagen, anchors blood vessel in place, contains vasa vasorum. Vasa vasorum: blood vessels for the blood vessel.
