BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Blood vessels. Light micrograph of blood capillary vessels, the smallest blood vessels. This network of vessels infiltrates the body's tissues and organs, supplying them with blood. Gases and nutrients are exchanged between the blood and surrounding tissue through the permeable walls of capillaries, with waste products being taken away. Magnification unknown.
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