lab_8 - Intestinal Motility GI Tract: Primary Function:...

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Intestinal Motility GI Tract: Primary Function: ingestion, digestion and assimilation of food followed by a removal of wastes. Ingestion : taking in food into the GI tract. Secretion: a) Exocrine: move into the lumen of the GI tract and function eg. salivary gland secretion, enzymes, acids, water etc. b) Endocrine: produced by GI tract cells (e.g. pancreas, small intestine epithelial cells) go down the blood stream to help coordinate activity in the gut, regulation of feeding and energy balance. Mixing (segmentation) and Propulsion (peristalsis): Mixing is caused by a side to side contraction while propulsion is caused by a constriction in the opral side of a bolus of food with relaxation occurring aborally. This makes sure that the food bolus travels downward further into the GI tract and not upwards toward the mouth. Digestion: Mechanical and Chemical Mechanical: teeth, segmentation and muscle action of gut Chemical: with the help of exocrine secretions: acids, enzymes and bile Absporption: Nutrients, small molecules, ions etc. are absorbed in the small intestine. Excretion: Indigestabl;e material is passed out though the tract. Large intestine absorbs out most of the H2O and the last of the nutrients before the wastes are passed out. Anatomy of the GI tract:
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lab_8 - Intestinal Motility GI Tract: Primary Function:...

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