STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Intestinal lining. Coloured scanning electron micrograph (SEM) of villi (yellow) from the lining of the small intestine. Villi are finger- like projections that increase the surface area available for the absorption of nutrients. Cells within the villi produce mucus (orange), a slippery substance that protects the lining and eases the passage of food along the intestines.
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