BIO202 - Ch 23 - Small Intestine - Marieb/Hoehn - RioSalado - AZ
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| Where does small intestine join the large intestine? | Ileocecal valve - right iliac region
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| Small intestine is __ part of the alimentary tube. | longest - 6-7 m (20 feet) in cadaver
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| 3 divisions of small intestine | duodendum, jejunum, & ileum
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| duodenum | Shortest division - 10 inches long - curves around head of pancreas - bile duct & main pancreatic duct.
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| Hepatopancreatic ampulla | Bulblike point in small intestine where bile & pancreatic duct enters.
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| What valve controls entry of bile & pancreatic juice to duodenum? | Sphincter of Oddi - hematopancreatic sphincter
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| jejunum | Middle section of small intestine
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| ileum | Last section of small intestine - joins large intestine at ileocecal valve.
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| Main arterial supplier of small intestine | Superior mesenteric artery
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| Plicae circulares | Circular folds in small intestine of mucosa & submucuosa helps in nutrient digestion.
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| Lacteal | Lymphatic capillary that receives fatty materials absorbed from intestines.
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| Histology of small intestine wall | Simple columnar, tight junctions with microvilli & goblet cells, endocrine cells & IELs (T Cells - intraepitheliallymphocytes).
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| Intestinal crypts of Lieberkuhn | Pits in small intestine where intestinal juice secreted by Paneth cells.
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| duodenal glands (Brunner's) | Produce alkaline (bicarbonate-rich) mucus
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| Intestinal juice | Alkaline (7.4-7.8 pH) - water, mucus, enzyme poor
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| __ is the most common motion of small intestine. | segmentation
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| What hormone in small intestine causes peristalic waves to take over segmenting movements. | Motilin from duodenal mucosa
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| Migrating Motility Complex (MMC) | Successive waves of peristalis in duodenum to ileum.
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| Gastroileal reflex | Ensures contents of previous meal are swept completely out of stomach & small intestine as next meal is eaten.
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