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Question

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.
So, the correct answer is option B.

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