CHAPTER 26 - CHAPTER 26 DIGESTIVE SYSTEM I GENERAL...

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CHAPTER 26: DIGESTIVE SYSTEM I. GENERAL STRUCTURE AND FUNCTIONS OF THE DIGESTIVE SYSTEM A. Basics i. Bolus , then chyme (paste like substance produced by the stomach) ii. 2 categories of organs: 1. Digestive organs (6) A. Collectively make the gastrointestinal (GI) track (digestive tract; alimentary canal). B. Forms a continuous tube from mouth to anus C. Oral cavity, pharynx, esophagus, stomach, small intestine, large intestine 2. Accessory digestive organs (6) A. Connected to the GI tract, but not a part of it. Helps GI tract digest material. B. Teeth, tongue, salivary glands, liver, gallbladder, pancreas B. Digestive system functions (6) i. Ingestion—introduction of food in the oral cavity. (1 st step) ii. Digestion—breakdown. 2 aspects: 1. Mechanical digestion—physical breakdown A. Mastication —chewing ingested material in oral cavity. First part of mechanical digestion. 2. Chemical digestion—uses enzymes iii. Propulsion—how they move through the GI. 2 types of movement involved: 1. Peristalsis —wave of muscular contractions of GI tract to move material (toothpaste analogy) 2. Segmentation —churning/mixing movements via contraction and relaxation of GI tract. Helps disperse material and mixes it w/ enzyme secretions and mechanically breaks down. iv.
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This note was uploaded on 03/30/2010 for the course BIO 1004 taught by Professor Nef during the Spring '10 term at Holy Family University.

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CHAPTER 26 - CHAPTER 26 DIGESTIVE SYSTEM I GENERAL...

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