SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Small intestine. Coloured scanning electron micrograph (SEM) of the inner surface of the first part of the small intestine, the duodenum. This surface, in common with the rest of the intestine, is greatly folded. The folds are called villi, and they form a large surface area for the absorption of nutrients into the bloodstream. Magnification unknown.
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