Digestive - Digestion and Nutrition How do we extract and...

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Digestion and Nutrition How do we extract and obtain nutrients from what we eat? I. Overview A. Mechanical processes B. Chemical processes C. Role in immunity II. The Digestive Tract A. Oral Cavity or Mouth 1. mechanical processes: breaking up food; mixing in saliva; forming bolus-saliva dampened ball of food 2. chemical processes: carbohydrate digestion=salivary amylase- breaks down carbohydrates; pH buffering; limited lipid digestion=salivary lipase-breaks down lipids as a child 3. immunity: lysozyme-anti-bacterial enzyme in saliva A. Swallowing the bolus 4. last voluntary act until defecation 5. pharynx: digestive-respiratory junction a. epiglottis-covers trachea and larynx-voice box covered by epiglotis B. Esophagus 6. Peristalsis= the waves of involuntary muscle contractions that transport food C. Stomach-storage, kill bacteria in food (absorbs alcohol, aspirin) 7. cardiac (gastroesophogeal) sphincter-entrance junction to stomach 8. gastrin-stomach produced hormone which sends signals to produce gastric juice
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This note was uploaded on 04/26/2009 for the course BCOR 1010 taught by Professor Latier,jef during the Fall '07 term at Colorado.

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Digestive - Digestion and Nutrition How do we extract and...

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