GI system part 1-3

GI system part 1-3 - Gastrointestinal system part 1-3 *List...

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Gastrointestinal system part 1-3 *List the functions of the GI system: processes ingested foods into molecular form suitable to transfer into the internal environment. Extract nutrients, eliminate residue. *What processes are necessary for digestion & absorption: Motility: ingestion, mastication, deglutition, and peristalsis. Secretion: exocrine secretions, and endocrine secretions. *List the components of the GI system: GI Tract: mouth, pharynx, esophagus, stomach, small intestine and large intestine. Accessory organs: salivary glands, liver, gall bladder, intestinal glands and pancreas. *List the 4 layers of the GI tract: (innermost to outermost) mucosa, submucosa, muscularis, serosa. *What is the correct order from the inside out: see previous *List the general features of the GI tract: mid-esophagus to anus: luminal surface highly convoluted stomach to anus: luminal surface covered by single layer of epithelial cells with tight junctions *List specific components of each layer of the GI tract: Mucosa: columnar epithelium Lamina propria-connective tissue; contains lymph nodules Muscularis mucosa- muscle; responsible for small folds Submucosa: connective tissue Highly vascular Contain glands Contains nerve plexuses Muscularis: inner circular muscle Myenteric plexus Outer longitudinal muscle Segmentation, peristalsis Serosa: binds and protects GI tract Connective tissue layer Squamous epithelium layer *List the general categories of GI tracts: Monogastric, Avian, Ruminant *List the subcategories of monogastric GI systems: omnivores, carnivores, fructivores, insectivores, hind gut fermenters *Example species having monogastric GI systems: humans, pigs, dogs, cats, horses, rabbits *List major salivary glands: (major salivary glands-paired) parotid- beneath the ears, submaxillary or submandibular- inside at back of jaw (or mandible), sublingual- below & to each side of tongue *List major components of the mouth and the function of each component: Lips- prehension, tongue- prehension & taste, teeth- prehension & particle reduction. Receives saliva
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*List major components of saliva and the function of each component: Mucin- lubrication, bicarbonate- buffering, salivary amylase- initiate starch digestion, water-
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This note was uploaded on 03/27/2008 for the course ANSCI 214 taught by Professor Brant during the Fall '07 term at Iowa State.

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GI system part 1-3 - Gastrointestinal system part 1-3 *List...

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