Parietal cells (oxyntic cells) secrete hydrochloric acid and castle intrinsic factor . HCl converts iron (in diet) from ferric to ferrous form which can be easily absorbed and used during erythropoiesis (formation of RBCs).
Castle intrinsic factor helps in absorbing vitamin-`B_(12)` and its deficiency causes pernicious anaemia.
The functions of other cells are follows
Mucous or Goblet cells secrete mucus that lines the stomach and protects it from the acid present in stomach.
Chief cells secrete gastric digestive enzymes as proenzymes or zymogens.
