A&P.tricOH.ch24.digest
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| digestive system consists of | digestive tract (a tube extending from the mouth to the anus) and its accessory organs
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| Digestive tract is also called | alimentary tract or alimentary canal
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| gastrointestinal tract (G.I.) technically only refers to the | stomach and intestines Note - it is often used as a synonym for the digestive tract
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| regions of the digestive tract include (7) | 1. Oral cavity 2. pharynx or throat 3. esophagus 4. stomach 5. small intestine 6. large intestine 7. anus
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| functions of the digestive system (8) | 1. Ingestion 2. mastication 3. propulsion 4. mixing 5. secretion 6. digestion 7. absoprtion 8. elimination
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| ingestion | take in food - normally, through mouth [also-nasogastric tube]
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| mastication | Chewing - solid foods must be broken down
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| propulsion | Movement of food - takes 24-35 hours; each segment is specialized to move its contents from oral end to anal end
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| Deglutition | Swallowing [L. de-glutio "swallowing"]
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| peristalsis | Peri "around" stalsis "constriction"
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| peristalsis | muscular contractions in digestive organs occur in peristaltic waves; these open in front of the food, then squeeze from behind
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| mass movements | contractions that extend over much larger parts of the digetive tract than peristaltic movements
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| mixing - food and secretions | food is moved back & forth to MIX it with digestive secretions & help break it into smaller pieces
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| segmental contractions | mixing contractions that occur in the small intestine
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| secretions have what purpose (name four) | lubricate, liquefy, buffer and digest
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| what is a lubrication? | mucus lubricates the food and the lining of the tract; coats and protects the peithelial cells from mechanical abrasion; from the damagin effect of acid in the stomach; and from digestive enzymes of the digestive tract
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| where is mucus found? | it is secreted along the entire digestive tract
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| what is used to liquefy? | Water-from secretions; also osmosis
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Created by:
walterina4327