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Final answer:

The stomach lining is protected from gastric juice acidity through mucus secretion and bicarbonate ions.


Explanation:

The epithelial lining of the stomach is protected from the low pH of gastric juice through several mechanisms:

  1. The surface mucus cells secrete a protective coat of alkaline mucus.
  2. The stomach lining contains a thick mucus layer that shields underlying tissue from digestive juices.
  3. The mucus layer contains bicarbonate ions that neutralize hydrochloric acid, preventing damage to stomach cells.

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