TOPICS: Cholecystokinin (CCK), I cells, duodenum, sphincter of Oddi, secretin, S cells, chloride/bicarbonate (Cl-/HCO3- antiporter), gastrin, glucose-dependent insulinotropic peptide (GIP), K cells, jejunum, pancreatic enzymes, insulin, motilin, migrating motor complexes (MMCs), vasoactive intestinal peptide (VIP), parasympathetic ganglia, bile, VIPoma, syndrome of water diarrhea hypokalemia, and achlorhydria (WDHA syndrome), enkephalins, opiates
