ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Small intestine. Light micrograph of a section through the duodenum, the beginning of the small intestine, which runs from the stomach to the large intestine. It is where digestion begins and nutrients are absorbed into the blood. 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: x70 when printed at 10 centimetres tall.
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