Digestion process stomach with function, Why the stomach wall is not digested by HCL?

Stomach:

• At stomach only protein breakdown occurs. No fat or no carbohydrate breakdown occurs in stomach.
• HCl and pepsinogen is secreted by parietal cells, by the action of histamine and cerulein hormones.
• Protein food materials is made up chyme in the presence of HCl and pepsinogen.

Function in HCl:

• HCl kills the prey and germs.
• HCl helps to break the tough food.
• Pepsinogen converts into pepsinin the presence of HCl.

Why the stomach wall is not digested by HC?
The lining of the stomach also has mucus cell. The mucus secreted from the cells, acts as a protection of stomach. The mucus lines the inner surface of the stomach, so pepsin and HCl can’t come in contact with the stomach muscles and thus the stomach is not digested.