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Answer :

The gastrointestinal system has two classes of such cells, the islets of Langerhans in the pancreas and the enteroendocrine cells in the mucosal epithelium of the stomach and intestine.

Answer: Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid.

Parietal cells: secrete hydrochloric acid.

Chief cells: secrete pepsin, a proteolytic enzyme.

Explanation: