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Digestive System

Digestive System - The Digestive System I II III The...

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01/28/08 The Digestive System I. The Organization of Life From elements to organism - Atoms - Molecules - Cells - Tissues - Organs - Organ systems - Organism II. The Digestive System Overview - The digestive system consists of the gastrointestinal tract and various accessory organs that take in food, digest it to extract energy and nutrients, and expel the remaining waste - Approximately 20 feet in length - Transit time varies, 24 to 72 hours Structure of the wall - Four tissue layers Mucosa o The layer of tissue lining the GI tract and other body cavities. o Turnover every 2-5 days. o High nutrient requirement o First parts of body affected by nutrient deficiency Connective tissue
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Smooth muscle (circular and longitudinal) Outer connective tissue. III. The Gastrointestinal Tract Mouth - Lined by mucosa - Parts Salivary glands o Moistens food o Lubricates upper GI tract o Protects from tooth decay (lysozyme) o Enzymatic breakdown of carbohydrates – salivary amylase Tongue o
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