NS 115 - Stomach Facts

NS 115 - Stomach Facts - • Exocrine GASTRIC JUICE About...

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Facts o J-shaped o Sympathetic Nervous System Tightens gastric tone, Decreases mucous secretion, Inhibits release of gastric acid o Parasynthetic Nervous system Relaxes stomach tone, Increases mucous secretion, Stimulates release of gastric acid o 3 Layers of Muscle longitudinal, circular, and diagonal. o Lining contains rugae which flatten as food fills in order to allow the walls to expand (holds more food) Function o Food storage Rugae unfold and flatten Mechanoreceptors signal brain that stomach is becoming full (stop eating) o Production and Release of Gastric Secretions Gastric Pits exocrine and endocrine cells here Endocrine cells (G cells) GASTRIN hormone stimulates exo cells to release gastric juice.
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Unformatted text preview: • Exocrine GASTRIC JUICE About 2L everyday. Mostly H2O, HCl, digestive enzymes, mucous, and intrinsic factor. o HCl parietal cells kills bacteria, dissolves food parts, provides acidic environment. Pepsinogen chief cells inactive form of pepsin breaks down protein. o Gastric Mixing and Formation of Chyme Muscle contractions mix food and G juice peristaltic contractions move food forward to SI o Gastric Dumping Rate at which food leaves stomach. Depends on volume, consistency (only fluid), and composition • Stomach is normally held in a tight state o Parasympathetic action relaxes the stomach so you can eat...
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This note was uploaded on 02/22/2010 for the course NS 1150 taught by Professor Levitsky during the Fall '05 term at Cornell.

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