STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Artery. Coloured transmission electron micrograph (TEM) of a transverse section through an artery. Red blood cells (erythrocytes, red) and white blood cells (leucocytes, beige/brown) can be seen in the central canal (lumen). The lumen is lined with a layer called the tunica intima, which is made up of epithelial cells (pale green) and elastic fibres (dark green). This layer lies underneath a layer of smooth muscle and elastic fibres (purple/), called the tunica media. The outermost layer of the artery is known as the tunica externa (not shown) which is mainly composed of collagen. Magnification: x1500 when printed 10cm wide.
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