what are blood vessels fmdsnatnrw
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They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.There are three kinds of blood vessels: arteries, veins, and capillaries.
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blood vessels:There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
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