Question

Who protects the stomack wall from hydrochloric acid secreted by it?
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Answer 1

In the stomach several mucosal defence mechanisms protect the stomach against hydrochloric acid and noxious agents. The pre-epithelial protection is made up by the mucus-bicarbonate barrier. Mucus and bicarbonate, secreted by mucus cells, create a pH gradient maintaining the epithelial cell surface at near neutral pH.

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Answer 2

$\Huge\mathbb\purple{MUCUS}$