The epithelial cells lining the stomach of vertebrates are protected from damage by HCI because
A
HCI is too dilute
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B
The epithelial cells are resistant to the action of HCI
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C
HCI is neutralised in the stomach.
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D
The epithelial cells are covered by a mucus secretion.
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Solution
The correct option is D The epithelial cells are covered by a mucus secretion. The epithelial cells lining the stomach of vertebrates are protected from damage by HCl because 'the epithelial cells are covered by a mucous secretion'.