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functions of the stomach
storage of food/large meal, digestion of food liquified into chyme, gastric secretions
production of HCL
produces acidic environment, softens/denatures proteins, prevents bacterial growth and spoilage of stored food
secreted by chief cells, inactive form is zymogen; once its secreted into stomach lumen, it is activated at low PH into pepsin which digests proteins and breaks peptide bonds
secrete a thick layer of mucus as a protective barrier on the surface of epithelial lining; is alkaline so its neutralizes pH across the surface, blocks digestive enzymes from damaging epithelial cells
secreted by G cells, targets the stomach, increases the secretion of gastric glands, and increases gastric motility
contractions of muscularis, mixes food with secretions through mechanical digestion and then empties into the small intestine
preparation to eat or currently eating; can be triggered by visual, smell, taste; small increase in gastric secretions, small increase in motility; under neural control from ANS and hypothalamus
food enters the stomach; there is a stretch in the stomach wall, chemoreceptors detect food; under parasympathetic fibers that stimulate increase motility of secretions, increase amount of gastrin; increased motility causes chyme to press against pyloric sphincter in waves
inhibits stomach as food/chyme enters small intestine; stretches wall of small intestine, chemoreceptors detect food particles; hormones are secreted
secreted by small intestine; gastric inhibiting peptide, decreases motility and gastric secretions
slows down stomach so that it empties slowly, may take 40 minutes to several hours to empty
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