In the stomach, Parietal cells produce [ Select ] ["mucous", "pepsinogen", "gastrin", "enteropeptidase", "hydrochloric acid"] , Chief cells produce [ Select ] ["hydrochloric acid", "gastrin", "mucus", "pepsinogen", "intrinsic factor"] , and G-cells secrete [ Select ] ["gastrin", "pepsin", "secretin", "enteropeptidase", "cholecystokinin"]