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Sarah English The Structure and Function Of Arteries, Veins and Capillaries In its route from the heart to the tissues, the blood passes through channels of six foremost types: elastic arteries, muscular arteries, arterioles, capillaries, venules and veins. I intend to explore the structure and function of arteries, veins and capillaries. When an artery branches into smaller and smaller vessels, eventually the blood vessel is too small to see with the naked eye. At that point, it is called an arteriole. Likewise, a venule is a microscopic vein. Arteries All arteries are comprised of three different layers but the proportion and structure of each varies with the size and function of the particular artery. A large artery, like the aorta, is comprised of the following layers, going from the inner to the most external layers: (1) The innermost narrow layer consists of a layer of endothelial cells separated from the inner layer by a thin...

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