Digestive System I - The Digestive System Figure 24.1...

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Unformatted text preview: The Digestive System Figure 24.1 Figure 24.1 The Components of the Digestive System Ingestion Mechanical processing Digestion Secretion Absorption Excretion Functions of the digestive system Ingestion: When Materials Enter the digestive tract. Mechanical Processing : Crushing and shearing that makes materials easier to propel along the GI tract. Digestion: Refers to CHEMICAL breakdown of nutrients to their smallest subunits which are suitable for absorption via epithelia. Secretion: Release of water, acids, enzymes, buffers and salts by glandular organs and epithelium of DT. Absorption ; Uptake of nutrients by epithelial cells of the digestive tract. Excretion and Defecation: They are different! Functions of Digestive System Figure 24.3 The Structure of the Digestive Tract Figure 24.3 Stomach : Initiates protein digestion Limited amount of absorption Moves food to small intestine Capacity = one liter Receives bolus from esophagus and mixes with gastric juices; mixture is called chyme Visceral smooth muscle shows rhythmic cycles of...
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This note was uploaded on 12/08/2011 for the course AMY 2B taught by Professor Dianeolin during the Summer '09 term at Riverside Community College.

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Digestive System I - The Digestive System Figure 24.1...

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