title: Frequency-force relationship in the blood-perfused canine papillary muscle preparation.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D002395:Catecholamines / Q000494:pharmacology; D004285:Dogs; D004558:Electric Stimulation; D066298:In Vitro Techniques; D009119:Muscle Contraction; D010210:Papillary Muscles / Q000098:blood supply / Q000502:physiology*; D010477:Perfusion; D013565:Sympatholytics / Q000494:pharmacology; D013779:Tetrodotoxin / Q000494:pharmacology
chemical_list: D000319:Adrenergic beta-Antagonists; D002395:Catecholamines; D013565:Sympatholytics; D013779:Tetrodotoxin; D001285:Atropine