The mucus secreted by the cells of the stomach wall serves mainly to
- A. digest cellulose
- B. kill every bacterium swallowed
- C. protect the stomach wall from acid and pepsin
- D. absorb glucose
Explanation
A layer of mucus shields the epithelium from hydrochloric acid and pepsin, which would otherwise digest the stomach itself. When this protection fails, ulcers can form.
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