Question

The inner lining of the stomach is protected by one of the following from the hydrochloric acid. Choose the correct one.

• A. Pepsin
• B. Mucus
• C. Salivary amylase
• D. Bile

Answer 1

The correct option is B

Mucus

The correct option is B.

Explanation of Correct Option:

• The hydrochloric acid is liberated into the stomach by parietal cells. It creates an acidic condition in the stomach that destroys the pathogenic organisms entering the food and allows the activation of certain enzymes.
• The stomach's inner lining is protected from the acid due to the presence of a layer of mucus. It is released by the mucous cells and acts as a protective barrier against acid.

Explanation of Incorrect Options:

Option A:

• Pepsin is an enzyme that is activated in the presence of hydrochloric acid. It is involved in digestion and does not prevent the stomach from acid.

Option C:

• The salivary amylase is not released in the stomach. Instead, it is an enzyme released in the mouth.

Option D:

• Bile is involved in breaking the fatty substances. They do not protect the stomach from acid.

Therefore, the mucus protects the stomach's inner lining from hydrochloric acid.