Gastric juice is the combined secretions of

Gastric glands have three major types of cells:(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 (essential for absorption of vitamin B12).Goblet cells and Paneth cells occur in the intestine.