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PH in stomach

What is the pH inside stomach? Why it is the required to keep that pH level? How it is maintained? Specify the cells which maintains that particular pH?

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Normal pH of gastric juice is about 2. Thus it is an acid pH. It is essential for the gastric pH to be kept acidic for activation of the pepsinogen, a proenzyme excreted by the gastric chief cells, into pepsin, digestive enzyme which acts under low pH. This pH level is achieved through the secretion of hydrochloric acid (HCl) by parietal cells.

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