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5 Cards in this Set
- Front
- Back
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What are the stomach's 3 main fxns?
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1. Storage: allows emptying into small intestine at a rate appropriate for optimal digestion/absorption
2. Secretes HCl: starts protein digestion 3. Mixing: mixes food with gastric secretions to make chyme |
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What are the stomach's volumes?
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Full-50cc
Empty-1500cc -Facilitated by rugae -Receptive releaxation allows an increase in volume w/o increase in pressure -Reflex relaxation triggered by eating via Vagus |
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What do pacesetter cells do?
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-Generate slow wave potentials (3/min) that move towards the pyloric sphincter
-Thick mm. have strong waves and thin mm. have weak waves |
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How does mixing occur?
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Via retropulsion
-Wave of chyme hits closed pyloric sphincter and splashes back into stomach |
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Factors which affect the rate of gastric emptying...
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1. Amt of chyme in stomach (major): proportional to the amt of chyme in stomach
2. Stomach distension via: direct stretch effect, involvement of intrinsic plexuses/vagus n., gastrin 3. Chyme fluidity: more fluid chyme empties faster |
