Capillaries are small blood vessels that allow for the exhange of oxygen and carbon dioxide with the cells. They have very thin walls so oxygen can leave the capillary and enter the cell. Capillaries are located between arteries (which bring the oxygenated blood) and veins (which take away the deoxygenated blood).
Capillaries are smallblood vessels, often only a single cell wide, that allow the blood to flow away from arteries and veins and into the rest of the body. They are also what causes bruises, when they get broken.
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