STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Artery. Transmission electron micrograph (TEM) of a transverse section through part of an artery. Red blood cells (erythrocytes) and platelets (2 small cells)) can be seen in the central canal (lumen). The lumen is lined with a layer called the tunica intima, which is made up of endothelial cells (inner layer) and elastic fibres (darker). This layer lies underneath a layer of smooth muscle called the tunica media. The outermost layer of the artery is known as the tunica externa which is mainly composed of collagen. Magnification: x400 when printed 10cm wide.
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