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BIO202-CH23-SmIntest
BIO202 - Ch 23 - Small Intestine - Marieb/Hoehn - RioSalado - AZ
| Question | Answer |
|---|---|
| Where does small intestine join the large intestine? | Ileocecal valve - right iliac region |
| Small intestine is __ part of the alimentary tube. | longest - 6-7 m (20 feet) in cadaver |
| 3 divisions of small intestine | duodendum, jejunum, & ileum |
| duodenum | Shortest division - 10 inches long - curves around head of pancreas - bile duct & main pancreatic duct. |
| Hepatopancreatic ampulla | Bulblike point in small intestine where bile & pancreatic duct enters. |
| What valve controls entry of bile & pancreatic juice to duodenum? | Sphincter of Oddi - hematopancreatic sphincter |
| jejunum | Middle section of small intestine |
| ileum | Last section of small intestine - joins large intestine at ileocecal valve. |
| Main arterial supplier of small intestine | Superior mesenteric artery |
| Plicae circulares | Circular folds in small intestine of mucosa & submucuosa helps in nutrient digestion. |
| Lacteal | Lymphatic capillary that receives fatty materials absorbed from intestines. |
| Histology of small intestine wall | Simple columnar, tight junctions with microvilli & goblet cells, endocrine cells & IELs (T Cells - intraepitheliallymphocytes). |
| Intestinal crypts of Lieberkuhn | Pits in small intestine where intestinal juice secreted by Paneth cells. |
| duodenal glands (Brunner's) | Produce alkaline (bicarbonate-rich) mucus |
| Intestinal juice | Alkaline (7.4-7.8 pH) - water, mucus, enzyme poor |
| __ is the most common motion of small intestine. | segmentation |
| What hormone in small intestine causes peristalic waves to take over segmenting movements. | Motilin from duodenal mucosa |
| Migrating Motility Complex (MMC) | Successive waves of peristalis in duodenum to ileum. |
| Gastroileal reflex | Ensures contents of previous meal are swept completely out of stomach & small intestine as next meal is eaten. |
Created by:
Ladystorm
on 2007-10-24