<prompt> Intrinsic factor is secreted by:Parietal cellsChief cellsMucus cellsG cells  <response>: Ans: A Parietal cells Ref: Guyton Hall, Gastric Secretion, In: Textbook of Medical Physiology, 12th ed, Philadelphia, Saunders, Elsevier 2012, p 777Explanation: Stomach mucosa has 2 types of tubular glands1. Oxvntic glands Gastric glands- secrete hydrochloric acid, pepsinogen, intrinsic factor and mucus.2. Pyloric glands - mucus for protection of the pyloric mucosa from the stomach acid; also secrete the hormone gastrin.Stomach oxyntic gland is composed of three types of cells:1. Mucous neck cells - secrete mainly mucus2. Peptic or chief cells - secrete large quantities of pepsinogen3. Parietal or oxyntic cells - secrete hydrochloric acid and intrinsic factor See figure on the next pageStructure of Gastric Glands and Cell Types 