Dictionary of Human Evolution and Biology

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Small Intestine

Proximal portion of the intestine that is between the stomach and the cecum. The small intestine receives its name from the smaller diameter (relative to the large intestine), although its length is greater than that of the large intestine, about 5.5 m long in the adult human. It consists of three regions, the duodenum, jejunum, and ileum. It is in the small intestine that most nutrients are absorbed.

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From "Dictionary of Nursing and Individual Health Care"