<prompt> Intrinsic factor is secreted byG-cellsPepsinogen secreting cellsParietal or oxyntic cellsPyloric glands  <response>: The substance intrinsic factor, essential for absorption of vitamin B12 in the ileum, is secreted by the parietal cells along with the secretion of hydrochloric acid. -G cells of antrum of stomach secrete hormone gastrin whose primary actions include stimulation of gastric acid secretion stimulation of growth of gastric mucosa. -Pepsinogen secreting cellspeptic cells of oxyntic glands secrete pepsinogenproenzyme which is conveed to pepsin active form by action of HCl.Pepsin is a proteolytic enzyme that regulates protein digestion. -The pyloric glands secrete mainly mucus for protection of the pyloric mucosa from the stomach acid. They also secrete the hormone gastrin. Reference: Guyton,11e 