GASTRIN muscarinIc antagonists RsoH N M K+ K+ YACh C CCK antagonists CCK2l K HIST HIST H+ K M2ECL cell CAMP-dependent ATPase X-proton pump inhibitors AC NSAIDS EP. c pathway parietal cell H+ X-antacids fatty bismuth PGl2 misoprostol metronidazole muscarinIc X-tetracyo antagonists clarithromycin H. pylor 80点 amoxicillin mucus ACh . Sucralfate protection carbonoxolon pirenzepine ACh superficial epithelial cell HCO Mucous Gastric Gastric structure related to peptic ulcer Layer Lumen H7 h 2