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Hydrochloric Acid Production

Hydrochloric Acid Production - Digestive System...

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Digestive System Hydrochloric Acid Production Summary of Stomach Secretions * Mucous neck cells-Mucous * Parietal cells- HCl & intrinsic factor * Chief cells- Pepsinogen * Enteroendocrine cells- histamine, gastrin, somatostatin Functions of Stomach Acid (HCl) * Activates pepsin and lingual lipase * Breaks up connective tissues and plant cell walls , helping to liquefy food and form chyme * Converts ingested ferric ions (Fe 3+ ) to ferrous ions (Fe 2+ ), a form of iron that can be absorbed and used for hemoglobin synthesis * Destroys ingested bacteria and other pathogens Pepsin * A digestive enzyme secreted as the inactive enzyme, pepsinogen (called a zymogen - an inactive enzyme) that is activated by the presence of HCl * It functions is to digest dietary proteins to a shorter peptide chain which then can pass to the small intestine, where their digestion is completed Hydrochloric Acid * HCl accumulates in the stomach while bicarbonate ions accumulate in the blood * Causing the blood leaving the stomach to be more basic while digestion is occurring. This
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