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9 Cards in this Set
- Front
- Back
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What type of excretory cells are found in the stomach? Where are they found?
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Oxyntic cells- deep regions of gastric pits
Mucous secreting cells- located in the neck region Chief cells cells- deep aspect of gastric pits |
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What are the two types of secretions produced by the stomach? How does the composition change with the secretory rate?
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Parietal juice- acidic produced by oxyntic cells
Alkaline juice- sodium rich produced by mucous cells. Composition of gastric juice becomes more acidic, with more chloride and hydrogen and less sodium, as the rate increases. |
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What are the three secretions from the oxyntic cells?
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Hydrochloric acid
Intrinsic factor Gastroferrin |
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How is hydrochloric acid secreted from oxyntic cells? How is it neutralized?
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Active process via proton pump.
Neutralized by secretions by the pancreas, liver and intestines. |
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What is the function of intrinsic factor?
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Complexes with vitamin B12 to allow for absorption in the ileum
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What is the function of gastroferrin?
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Complexes with iron in the stomach to facilitate absorption in the small intestine.
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What is the function of pepsin?
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Proteolytic enzyme that digests protein.
Hydrolyzes peptide linkages. Secreted as pepsinogen. |
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How is pepsinogen activated?
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Acid and more pepsin activate pepsinogen to pepsin.
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What substances are absorbed in the stomach?
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Aspirin and alcohol
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