title: Effects of ouabain and catecholamines on the refractory periods and contractions of isolated atria.
mesh_terms: D000818:Animals; D002395:Catecholamines / Q000494:pharmacology*; D004558:Electric Stimulation; D006168:Guinea Pigs; D006325:Heart Atria / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects*; D010042:Ouabain / Q000494:pharmacology*; D011433:Propranolol / Q000494:pharmacology*; D051381:Rats
chemical_list: D002395:Catecholamines; D010042:Ouabain; D011433:Propranolol