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Capillary system. Computer illustration showing oxygenated blood (red) entering a capillary bed from an artery and de-oxygenated blood (blue) leaving the bed and entering a vein. Capillaries are minute blood vessels that convey blood between the arteries and veins of the body and are the site of gas exchange in the body's tissues. They carry oxygen (O2) and other nutrients, such as glucose to the tissues and remove carbon dioxide (CO2) and waste products.

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