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In page Stomach:

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The mucosa lining the stomach is lined with gastric pits, which receive gastric juice, secreted by between 2 and 7 gastric glands.[citation needed] Gastric juice is an acidic fluid containing hydrochloric acid and digestive enzymes.[1] The glands contains a number of cells, with the function of the glands changing depending on their position within the stomach.[citation needed]