ES 207 Chapter Notes - Chapter 13: Tunica Media, Elastic Fiber, Simple Squamous Epithelium
22 Dec 2016
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Blood vessels carry blood within two or three cell diameters of nearly all the trillions of cells that make up the body. Pulmonary vessels: transport blood from the right ventricle through the lungs and back into the left atrium. Systemic vessels: transport blood through all parts of the body from the left ventricle and back into the right atrium. Transport substances (hormones, components of immune system, enzymes, coagulation molecules, gasses etc. ) Directs blood flow to the tissues where its required to maintain homeostasis. Three main types of vessels: arteries, capillaries, and veins. Arteries are classified as elastic arteries, muscular arteries and arterioles. Capillaries: blood flows from arterioles to capillaries where exchange is done between blood and tissues. They have thinner walls that arteries, blood flows slow. Veins: blood flows from capillaries to veins which carry blood back into the heart, usually oxygen poor blood, thinner than arteries, and contain less smooth and elastic tissue.
