STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Intestinal lining. Transmission electron micrograph (TEM) of a section through the epithelial lining of the small intestine, showing the densely packed microvilli (red adn pink, top). These tiny structures form a dense brush-like covering that increases the absorptive surface area of the cells lining the small intestine, through which the cells absorb nutrients from digested food. A goblet cell (green) can also be seen. Goblet cells secrete mucus (brown) to protect the lining of the intestine. Magnification: x1500 when printed 10 centimetres wide.
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