. HCl is a corrosive acid, how is the stomach protected from the effect of HCl? Mention the role of HCl in digestion

Hydrochloric acid, (very strong acid), is secreted by the parietal cells present in the stomach.

The innermost layer of stomach is called mucosa. It’s a simple epithelial tissue. These mucus cells found throughout the stomach lining secrete mucus which protects the stomach from the strong acidic action of Hydrochloric Acid. Mucus contain Bicarbonate ions (HCO3) - As these bicarbonate ions are alkaline in nature, they neutralise the effect of this strong Hydrochloric Acid. Thus the continuous secretion of these bicarbonate ions protects the stomach from being digested by hydrochloric acid.

Role of Hydrochloric acid in digestion
Hydrochloric acid activates pepsinogen which gets converted in to pepsin. Pepsin is an active enzyme that helps in the digestion of protein by breaking it into its simpler unit’s peptides and amino acids.
It maintains a PH in the stomach.
It helps in killing the micro organisms present in our food.

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