Which among the following protects the lining of the stomach from hydrochloric acid?
A
Pepsin
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B
Mucus
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C
Salivary amylase
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D
Bile
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Solution
The correct option is B Mucus The stomach wall has gastric glands that secrete gastric juice, which is a mixture of enzymes, HCl, and mucus. The stomach wall is always covered by a layer of thick mucus that serves two purposes. One is the lubrication of food masses in order to facilitate movement within the stomach. The other function is to form a protective layer over the epithelium lining of the stomach wall. This mucus layer prevents the lining of the stomach wall from the acidic environment, created by HCl.