title: Cardioactive substances in blood: the actions of serotonin on isolated guinea-pig atria.
mesh_terms: D000818:Animals; D001790:Blood Physiological Phenomena; D002118:Calcium / Q000494:pharmacology; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D012701:Serotonin / Q000097:blood / Q000494:pharmacology*
chemical_list: D012701:Serotonin; D002118:Calcium; D009638:Norepinephrine