LM of human duodenum, x20.

LM of human duodenum, x20.

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Credit: JOHN BURBIDGE/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a section of the wall of the human duodenum, showing the many tiny folds, known as villi, which project 0.5 to 1 mm out into the intestinal lumen. These folds greatly increase the effective absorptive and secretory surface of the mucosa (mucus membrane) which lines the small intestine. The human small intestine is about 6 metres in length and is divided into three sections: the duodenum (which has long, ridge-like villi), the jejunum (with shorter, tongue-like villi) and the ileum (with finger-like villi). Magnification: x20 at 6x6cm size.

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Keywords: anatomy, digestion, digestive system, duodenum, gut, human body, intestine, light micrograph, small intestine, villus

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