Why doesn't the gastric juice damage the wall of the stomach?

The gastric juice, which contains hydrochloric acid and digestive enzymes, is highly corrosive; however, the stomach is protected by a thick layer of mucus that lines its walls. This mucus barrier acts as a lubricant and a protective shield, preventing the acid from eroding the stomach tissue. Additionally, the stomach's epithelial cells are rapidly renewed, helping to replace any damaged cells. Together, these mechanisms ensure that the gastric juice does not harm the stomach itself.