Frequency-force relationship in the blood perfused papillary muscle of the dog.
D000818:Animals; D001285:Atropine / Q000494:pharmacology; D004285:Dogs; D004558:Electric Stimulation; D006352:Heart Ventricles; D010210:Papillary Muscles; D010227:Parabiosis; D013565:Sympatholytics / Q000494:pharmacology; D013779:Tetrodotoxin / Q000494:pharmacology; D013997:Time Factors
D013565:Sympatholytics; D013779:Tetrodotoxin; D001285:Atropine