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Arteries, Capillaries, and veins are a network system with different functions and structures which work together to keep the body at homeostatic state. This vast system of blood vessels “Is about 60,000 miles long, that is enough to long enough to go around the world more than twice.” (Beckerman, 2019) To begin, Arteries carry blood away from the heart in a high pressure. The blood is oxygenated and brought to other tissues and organs, while veins bring back deoxygenated blood back to the heart, in a low pressure. The structure of artery contains three different layers, the middle layer is the most important it is mainly smooth muscle which provides support for the artery, it also changes the diameter of the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells. An interesting fact about capillaries is that “About 5 percent of the total blood volume is in the systemic capillaries at any given time. Another 10 percent is in the lungs.” (Classification & Structure of Blood Vessels, n.d.). Lastly come the veins, veins not only take back blood to the heart, but veins are rich in waste products that are to be excreted or removed from the body. Veins become larger as they get closer to the heart. “The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.” (Beckerman, 2019). Veins contain the same structure as arteries but contain less muscle tissue, and connective tissue, due to this is the walls of a vein are thinner, and thus having less pressure than arteries.
Beckerman, J. (2019, November 6). What are the three main types of blood vessels? Retrieved December 3, 2019, from https://www.webmd.com/hypertension-high-blood-pressure/qa/what-are-the-three-main-types-of-blood-vessels.
Classification & Structure of Blood Vessels. (n.d.). Retrieved December 3, 2019, from https://training.seer.cancer.gov/anatomy/cardiovascular/blood/classification.html.