STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood vessels. Light micrograph of a section through tissue showing an artery (bottom left) and a vein (top right). Two nerve fibres (dark blue) are also seen. Surrounding the artery and vein are layers of smooth muscle (purple), and fibrous connective tissue (green). Arteries carry blood away from the heart, while veins carry blood back to the heart from the rest of the body. Magnification: x13 when printed at 10 centimetres wide.
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