DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Small intestine. Light micrograph of a section through the ileum, the final part of the small intestine. The interior (lumen, top) is lined with villi, which are folds in the intestinal surface that greatly increase the surface area for absorption. As well as absorptive cells the villi contain goblet cells, which secrete mucus to lubricate the passage of the partly digested food through the intestine. Magnification: x37 when printed at 10 centimetres.
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