STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Intestinal lining. Coloured scanning electron micrograph (SEM) looking down on a surface of the small intestine. This is the internal surface that secretes digestive fluids and absorbs nutrients from digested food. Some strands of mucus (purple) are seen. It is heavily folded, forming projections called villi. This folding increases the surface area available for absorption. Magnification unknown.
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