The gastric glands found in the lining of the stomach’s fundus secrete parietal cells. These cells are responsible for producing the gastric acids needed for digestion. By age two, acid secretion in the stomach reaches adult levels. Smell, taste, and the thought of food initiate these secretions. Gastric acids are highly corrosive, equaling the pH levels found in battery acid. The stomach must produce a new layer of mucus every two weeks to protect itself from these powerful gastric acids, which could eat through the stomach’s lining if the mucus wasn’t there to protect it.

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