Lect 3, text 90-96 - 1 Overview of the Digestive System...

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Overview of the Digestive System Gastrointestinal (GI) Tract: hollow tube that runs from mouth to anus - Organs that make up GI tract: o Oral Cavity (mouth and pharynx) o Esophagus o Stomach o Small Intestine o Large Intestine - Accessory Organs that participate in digestion but are not part of GI tract: o Salivary Glands o Pancreas o Biliary System (Liver and Gallbladder) All release secretions needed into ducts, that empty into the lumen o Lumen: cavity inside a tubular structure of body that spans length of GI tract GI Tract and Accessory Organs Three Important Functions: 1. Digestion—physical and chemical breakdown of food 2. Absorption—transfer of nutrients from digestive tract into blood or lymphatic circulatory systems 3. Elimination—process whereby solid waste (feces) is formed and expelled from body i. Transit time: amount of time between consumption of good and elimination; can be 24-72 hours a. Affected by diet, illness, medications, activity, and emotions Sphincters: bands of smooth muscle that act as one one-way valves, regulating flow of luminal contents from one organ to next Organization of GI Tract: - Contains four major tissue layers, contribute by providing secretions,
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This note was uploaded on 02/23/2008 for the course NS 1150 taught by Professor Levitsky during the Fall '05 term at Cornell University (Engineering School).

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Lect 3, text 90-96 - 1 Overview of the Digestive System...

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