title: Paradoxical effect of hypercapnia on toad heart muscle.
mesh_terms: D000818:Animals; D002022:Bufo arenarum; D006352:Heart Ventricles / Q000503:physiopathology; D006935:Hypercapnia / Q000503:physiopathology*; D009200:Myocardial Contraction / Q000187:drug effects; D011217:Practolol / Q000494:pharmacology; D011292:Premedication; D012110:Reserpine / Q000008:administration & dosage; D013696:Temperature
chemical_list: D012110:Reserpine; D011217:Practolol