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The mucosa of stomach has gastric glands. Gastric glands have three
major types of cells namely -
(i) mucus neck cells which secrete mucus;
(ii) peptic or chief cells which secrete the proenzyme pepsinogen; and
(iii) parietal or oxyntic cells which secrete HCl and intrinsic factor
(factor essential for absorption of vitamin B12).
Answer : (a)