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The mechanism of gallbladder contraction induced by infusion of hydrochloric acid (HCl) into the duodenum in dogs with chronic Jones gallbladder cannula, Thomas pancreatic fistula and gastric fistula was investigated. The results were as follows:1. Atropine, hexamethonium and diphenhydramine, but not phentolamine, propranolol, and naloxone decreased the gallbladder pressure elevated by duodenal ac
