BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrograph of a section through tissue showing an artery and a vein. Nerve fibers are also seen. Surrounding the artery and vein are layers of smooth muscle, and fibrous connective tissue. Arteries carry blood away from the heart, while veins carry blood back to the heart from the rest of the body.
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