MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Capillary system. Computer illustration showing oxygenated blood (red) entering a capillary bed from an artery (vertical, right) and de-oxygenated blood (blue) leaving the bed and entering a vein (vertical, left). 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, red molecules) and other nutrients, such as glucose (white) to the tissues and remove carbon dioxide (CO2, black and red molecules) and waste products.
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