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Bio 260 Digestive System part 2

Bio 260 Digestive System part 2 - Secretion(Trip 2...

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Secretion (Trip 2)
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Secretion What secretions are there? What is function of secretions Regulation of secretion
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Mouth Secretion: Salivary Glands Parotid Submandibular Sublingual
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Saliva: water, enzymes, bacteriostatic Protects: cleanses, buffers, IgA and lysozyme 1.5 liters Moistens food for taste Digests : salivary amylase for carbohydrates (Salivary amylase, too) Lubricates via mucous
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Salivary Glands Figure 23.9a
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Control of Salivation 1. Autonomic nervous system: Parasympathetic mostly 2. Thought , smell, or taste of food, sour stimuli, nausea 3. Inhibit: fear, fatigue
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Esophagus Secretion Lubrication (mucus) for travel to stomach
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Stomach Secretion Mucus: throughout stomach Pepsinogen: HCl: fundus and body Intrinsic factor: fundus and body Gastrin: pyloris to blood to stomach (G cells) Histamine: fundus and body, secreted into lamina propria, not lumen
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Specialized Cells Gastric pits vs gastric glands Parietal cells : HCL, intrinsic factor Chief cells : pepsinogen Mucous neck cells : mucous Enteroendocrine cells : gastrin
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