Question

Identify the cells whose secretions protect the lining of the gastrointestinal tract from various enzymes.

• A. Chief cells.
• B. Goblet cells.
• C. Oxyntic cells.
• D. Duodenal cells.

Answer 1

The correct option is B

Goblet cells.

The correct option is B.

Explanation for the correct option:

1. The lining of the gastrointestinal tract walls is protected from strong secretions by goblet cells, whose secretions are mucus and bicarbonates.
2. It also contributes to the lubrication of the path.
3. The primary protective action of mucus secreted by goblet cells is against the strongest hydrochloric acid produced, which can otherwise cause gut lining erosion.

Explanation for the incorrect options:

Option A:

1. Chief cells, also known as peptic cells, are found in the stomach and secrete pepsinogen, which when exposed to the hydrochloric acid produced by the stomach is converted to the active enzyme pepsin, which is a protein-digesting enzyme.
2. It also produces gastric lipase enzymes, which break down triglycerides into fatty acids and simpler mono and diglycerides.

Option C:

1. Oxyntic cells, also known as parietal cells, are stomach epithelial cells that secrete hydrochloric acid and intrinsic factors.
2. The acid secreted aids in the destruction of harmful microbes in the stomach and intrinsic factors aid in vitamin B absorption.

Option D:

1. Enterocytes, which include goblet cells and certain endocrine cells, are present in the region and are known as duodenal cells.
2. Duodenal cells are found on the intestine wall, hence the name.

Final answer: Goblet cell secretions protect the lining of the gastrointestinal cell tract from various enzymes.