Bio 260 Digestive System part 1

Bio 260 Digestive System part 1 - The Digestive System...

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The Digestive System
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Introduction The alimentary canal (gastrointestinal or GI tract) and accessory structures digest and absorb food Alimentary canal – mouth, pharynx, esophagus, stomach, small intestine, and large intestine Accessory digestive organs – teeth, tongue, gallbladder, salivary glands, liver, and pancreas
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Digestive System: Overview Figure 23.1
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Digestive Process The GI tract is a “disassembly” line Nutrients become more available to the body in each step There are six essential activities: Ingestion, propulsion, and mechanical digestion Chemical digestion, absorption, and defecation
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Figure 23.2
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Peristalsis and Segmentation Figure 23.3
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Regulation of Digestion Involves: Mechano- and Chemo-receptors Detect Stimuli: osmolarity stretch pH specific nutrients (peptides, fats, etc) Muscles and cells Respond to stimuli: Contraction Secretion Mediated by local (enteric), central (brain/cord) nervous systems, and chemosensitive cells.
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Nervous Control of the GI Tract Figure 23.4
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Histology of the Alimentary Canal Four layers esophagus to anal canal From the lumen outward: mucosa submucosa muscularis externa serosa
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Histology of the Alimentary Canal Figure 23.6
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Enteric Nervous System Two major intrinsic nerve plexuses Submucosal nerve plexus regulates glands and smooth muscle in the mucosa Myenteric nerve plexus Major nerve supply that controls GI tract mobility Segmentation and peristalsis are largely automatic involving local reflex arcs Linked to the CNS via long autonomic reflex arc
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3 Salivary Glands Figure 23.9a
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Pharynx ”Throat” Long Passageway Same Street, Different Names
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This note was uploaded on 06/20/2011 for the course BIOL 260 taught by Professor Martino during the Spring '10 term at Carthage.

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Bio 260 Digestive System part 1 - The Digestive System...

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