title: Some pharmacological responses of isolated internal anal sphincter strips from chronically constipated children.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D001003:Anal Canal / Q000294:innervation / Q000503:physiopathology*; D002395:Catecholamines / Q000494:pharmacology; D002648:Child; D003248:Constipation / Q000503:physiopathology*; D004558:Electric Stimulation; D006801:Humans; D008531:Megacolon / Q000503:physiopathology
chemical_list: D002395:Catecholamines; D000109:Acetylcholine