Digestive System - The The Digestive Digestive System...

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Unformatted text preview: The The Digestive Digestive System System Provide the body w/nutrients, water and electrolytes. The organs of this system are responsible for: • Food ingestion • Digestion • Absorption • Elimination The digestive system consists of a hollow tube extending from the mouth to the anus. Various accessory organs empty secretions into them. What is the function of the digestive system? The digestive tube is called the alimentary canal or gastrointestinal tract (GI) 1 food is broken down physically- Digestive Process Digestive Process 1. 1. Ingestion Ingestion 2. 2. Propulsion Propulsion 3. 3. Mechanical Digestion Mechanical Digestion • Mastication Mastication • Churning food in stomach Churning food in stomach 4. 4. Chemical digestion Chemical digestion 5. 5. Absorption Absorption 6. 6. Defecation Defecation GI Tract- 4 basic tunics: 1.Mucosa 2.Submucosa 3.Muscularis externa 4.Serosa (adventia) GI Tract (alimentary canal) GI Tract (alimentary canal) 1. Mucosa- wet epithelial membrane Major function: • secretion • absorption • protection • reduce friction • protect cells from being digested 2. Submucosa- moderately dense connective tissue Contains: • blood • lymphatic vessels • scattered lymph nodules and nerve fibers Major function: • nutrition • protection 3. Muscularis externa- bilayer of smooth muscle and superficial longitudinal muscle...
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This note was uploaded on 04/19/2011 for the course BIOL 101 taught by Professor Wong during the Fall '09 term at University of Hawaii, Manoa.

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Digestive System - The The Digestive Digestive System...

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