chapter21a The Digestive System 1

chapter21a The Digestive System 1 - Chapter 21a The...

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Chapter 21a The Digestive System
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About this Chapter Digestion function and processes Anatomy of the digestive system Motility Secretion Regulation of GI function Digestion and absorption
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About this Chapter The cephalic phase The gastric phase The intestinal phase Immune functions of the GI tract
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Activities of the Digestive System Ingestion Digestion Mechanical Chemical / Secretion Motility Peristaltic Segmentation Absorption Immunity Elimination Note: 1. Which of these activities occur at each region of the GI tract. 2. Explain how these activities occur, control (hormones or neural), enzymes and structural mechanisms, no need to name the transporters.
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Figure 21-1 Digestive Function and Processes The volume of fluid entering the GI tract must equal the volume leaving 9 liters per day 7.5 L from small intestine 1.4 L from large intestine 0.1 L in feces 9.0 L removed from lumen 2.0 L food and drink 1.5 L saliva (salivary glands) 0.5 L bile (liver) 2.0 L gastric secretions 1.5 L pancreatic secretions 1.5 L intestinal secretions 9.0 L Total input into lumen Absorption Excretion Fluid input into digestive system Fluid removed from digestive system Ingestion Secretion
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Figure 21-2 Four Basic Processes of the Digestive System SECRETION DIGESTION ABSORPTION MOTILITY Lumen of digestive tract Wall Interstitial fluid Blood Food
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