Lect 5, text 98-102 & 186-188 & 240-242

Lect 5, text 98-102 & 186-188 & 240-242 -...

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Unformatted text preview: 98-102Temporary Storage for Food:-Rugae: convoluted pleats that are folded that allows the stomach to expand oLike an accordionoWhen stomach walls stretch, triggers mechanoreceptors to signal brain that stomach is becoming fullbrain causes hunger to diminish Production of Gastric Secretions:-Gastric Pits: holes in the stomach lining penetrating deep into the mucosal layer oContain exocrine and endocrine cells that produce and release digestive secretions and hormonesoExocrine Cells (parietal cells, chief cells, and mucus cells) release secretions into ducts that empty directly into stomachSecretions consist of water, HCl, enzymes, mucus, and intrinsic factor oEndocrine Cells: hormone-producing cells that release secretion into blood-Gastrin: hormone that regulates release of gastric secretions oStimulated by food in stomach oStimulates exocrine cellsspecifically causing HCl and intrinsic factor from the parietal cells and pepsinogen (pepsin breaksdown protein) from chief cells-Gastric Mucosal Barrier: protects stomach lining from acidic gastric jucie...
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Lect 5, text 98-102 & 186-188 & 240-242 -...

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