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interactions with nerves and hormones , and so forth. under normal conditions, these various elements work together in a dynamic harmony to maintain the flow of blood throughout the body. blood circulating through the blood vessels facilitates not only exchange of gases and nutrients with the body's many cells
, but also maintenance of optimum ph , and movement of hormones , enzymes , lipoproteins, immune cells , and other factors essential to life contents types anatomy physiology role in disease references credits types the three principal categories of blood vessels are arteries , veins , and capillaries...
https://www.newworldencyclopedia.org/entry/Blood_vessel