title: Morphine antagnoizes the positive chronotropic effect of prostaglandins in guinea pig atria but not the increase in cyclic AMP content.
mesh_terms: D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006168:Guinea Pigs; D006325:Heart Atria / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009206:Myocardium / Q000378:metabolism; D011448:Prostaglandin Antagonists / Q000494:pharmacology*; D011458:Prostaglandins E / Q000494:pharmacology; D013268:Stimulation, Chemical
chemical_list: D011448:Prostaglandin Antagonists; D011458:Prostaglandins E; D009020:Morphine; D000242:Cyclic AMP