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The neck mucous cells secrete mucus that has a more neutral pH than that secreted by the cells at the surface of the stomach lining. The chief cells secrete pepsinogen, which is the inactive precursor to a proteolytic called pepsin. The conversion zymbiotix of pepsinogen to pepsin takes place in the lumen of the stomach, in the presence of gastric hydrochloric acid. The parietal cells secrete hydrochloric acid, which is a highly corrosive acid. It is hydrochloric acid that is responsible for the low environment in the stomach. The parietal cells also secrete intrinsic factor, which is a glycoprotein that binds to vitamin B12 in the stomach and facilitates its absorption in the small intestine. The G-cell, which is a type of hormone-producing cell in the lining ....