Question

If hydrochloric acid is so strong that it can break complex food molecules, why does it not affect the walls of stomach?

• A. Pepsin is basic which neutralizes HCl and prevents damage to stomach.
• B. Stomach is internally protected by mucous membrane which prevents the action of HCl.
• C. Salivary amylase secreted in the mouth still remains in the bolus which prevents damage to the stomach.
• D. All of these

Answer 1

The correct option is B Stomach is internally protected by mucous membrane which prevents the action of HCl.

Mucus is also secreted along with the gastric juice. The mucus protects the walls of the stomach from the effect of HCl.