title: Calcium antagonism of the inhibitory effect of normorphine on the ileum of the morphine-tolerant and nontolerant guinea pig.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D002413:Cations, Divalent / Q000494:pharmacology; D006168:Guinea Pigs; D006801:Humans; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D007811:Lanthanum / Q000494:pharmacology; D008297:Male; D009021:Morphine Dependence / Q000503:physiopathology*; D009022:Morphine Derivatives / Q000037:antagonists & inhibitors*; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*; D009197:Myenteric Plexus / Q000187:drug effects; D009270:Naloxone / Q000494:pharmacology
chemical_list: D002413:Cations, Divalent; D009022:Morphine Derivatives; D009270:Naloxone; D007811:Lanthanum; D000109:Acetylcholine; D002118:Calcium; C010616:normorphine