Digestive System

Digestive System - Digestive System (Gastrointestinal/GI...

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Digestive System (Gastrointestinal/GI System) Functions 1. Ingestion: getting food to organism (ex: putting food into mouth) 2. Digestion a. Mechanical: mastication, peristalsis (muscle contraction to break food apart, adds chemicals), etc. b. Chemical: enzymes, acids, bases Proteins (polymer) amino acids (monomer) for absorption Lipids glycerol and fatty acids Carbohydrates di/monosaccharides 3. Absorption: getting food INTO organism (into means crossing a cell membrane/barrier into the bloodstream) 4. Egestion (elimination of materials): defecation, feces 5. Produce enzymes, etc. for chemical digestion 6. See liver 7. Immune function via mesenteric patches (lymphocytes = 1 st line of defense) 8. Etc… Figure 18.1: summary of digestive system Figure 18.6 (pg. 641): oral cavity structures Hard palate: palatine portion of maxilla and palatine bone Soft palate: muscle tissue, farther back than hard palate Uvula: part of soft palate that moves posteriorly to block nasal cavity so food moves down, not up; uvula normally blocks digestive system so you can breathe thru nose Tonsils Oral vestibule: between lips and teeth Figure 18.11: exocrine glands (materials release to “outside” of body)
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Digestive System - Digestive System (Gastrointestinal/GI...

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