PGY300lec7GI copy

PGY300lec7GI copy - Large Intestine Silverthorn pages...

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Large Intestine Silverthorn pages 707-710 Dr John A. Krasney
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Functional Anatomy Ileocecal Valve Cecum Appendix Ascending Colon Transverse Colon Descending Colon Sigmoid Colon Rectum Anus Taenia Coli Haustrae Luminal mucosa lacks villi Colonocytes Mucus Goblet cells Crypts
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Functions of the Colon Reservoir Absorption Secretion Some bacterial digestion.
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Colon Absorption Nutrients are not absorbed in colon. Absorption of water and electrolytes (1.9l) to dehydrate the feces. Colonocytes absorb Na + and Cl - and water follows osmotically.
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H 2 O
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Colon Secretion Crypt cells secrete small amounts of Na + , Cl - , water and mucus to lubricate the contents of the colon.
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K Na + -K + -2Cl - co-transporter
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Fermentation of carbohydrates that escape small intestinal digestion and absorption, e.g lactose. Bacteria can produce some absorbable
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PGY300lec7GI copy - Large Intestine Silverthorn pages...

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