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SCAN0028 - Large Intestine Microscopic Anatomy I Colon...

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Unformatted text preview: Large Intestine: Microscopic Anatomy I Colon mucosa is simple columnar epithelium except in the anal canal Has numerous deep crypts lined with goblet cells Anal canal mucosa is stratified squamous epithelium Anal sinuses exude mucus and compress feces Superficial venous plexuses are associated with the anal canal Inflammation of these veins results in itchy varicosities called hemorrhoids (59.5.31 u M. MW am. ,am. 1AM“: i; is. “m saws. Functions of the Large Intestine I Other than digestion of enteric bacteria, no further digestion takes place I Vitamins, water, and electrolytes are reclaimed I Its major function is propulsion of fecal material toward the anus ‘ I Though essential for comfort, the colon is not essential for life (Am-.2; mum um» rum is. mam: a 1mm uni-m Defecation I Distension of rectal walls caused by feces: I Stimulates contraction of the rectal walls I Relaxes the internal anal sphincter I Voluntag signals stimulate relaxation of the external anal sphincter and defecation occurs “4%.” w mm, Mamer-v ,mm.. H mm». mam I The bacterial flora of the large intestine consist of: I Bac eria surviving the small intestine that enter the cecum and I These entering via the anus I These bacteria: I Colonize the colon I Ferment indigestible carbohydrates I Release irritating acids and gases (flatus) I Synthesize B complex vitamins and vitamin K “m,“ x: :cm rum ”am.“ hi. aims ... a...” ecu-W of the Large Intestine I Haustial contractions I Slow segmenting movements that move the contents of the colon I Haustra sequentially contract as they are stimulated by distension I Presence of food in the stomach: vates the gastrocolie reflex ' ates peristalsis that forces contents toward the m m be, mm; . Man at Digestion: Carbohydrates I Absorption: via cotransport with-Na‘L7 and facilitated diffusion I Enter the capillary bed in the villi I Transported to the liver via the hepatic portal vein i I Enzymes used: salivary amylase, pancreatic amylase, and brush border engines swam :- :«u Wm M mm «garm- 4. Wm 7/7/2010 ...
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