The mucus secreted by the cells of the stomach wall serves mainly to
Correct answer: C. protect the stomach wall from acid and pepsin
- 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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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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