Small intestine

Small intestine - Smallintestine Anadult':thefirst10to12...

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Small intestine The soupy mixture called chyme spurts from the stomach through a sphincter into the small intestine.  An adult's small intestine is about 23 feet long and is divided into three sections: the first 10 to 12  inches form the  duodenum;  the next 10 feet form the  jejunum;  and the final 12 feet form the  ileum.  The inner surface of the small intestine contains numerous fingerlike projections called  villi . Each  villus has projections of cells called  microvilli  to increase the surface area.  Most chemical digestion takes place in the duodenum. In this region, enzymes digest nutrients into  simpler forms that can be absorbed. Intestinal enzymes are supplemented by enzymes from the  pancreas , a large, glandular organ lying near the stomach. In addition, bile enters the small intestine  from the gall bladder to assist in fat digestion. 
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

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