BIOL-2230 Lecture Notes - Lecture 7: Pinocytosis, Cardiac Output, Skeletal Muscle
22 Feb 2017
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Arteries: carry away from the heart, elastic. Closest to the heart, has the largest diameter in the wall. Has sheets of elastic connective tissue: muscular. Less elastin, more smooth muscle as we travel away from the heart. Distal from the heart to elastic arteries. Taking blood to individual organs: highest blood pressure. Arterioles: smaller diameters farther from the heart. Capillaries: take blood from arteries to veins, site of nutrient and gas exchange, microscopic blood vessels. Veins: carry towards the heart, lowest blood pressure, specifically vena cava, less smooth muscle and elastin. Tunica interna: innermost layer, the later that needs platelets. Tunica media: activated by sympathetic nervous activity. Tunica externa: made up of collagen, anchors the blood vessel in place, vasa vasorum. Tiny blood vessels to provide nutrients for the tunica externa. Continuous: most capillaries in our body, cells tightly joined together, most fluids have to use pinocytosis (pinocytic vesicles) Only have the tunica interna: simple squamous epithelium (easy diffusion)
