title: Selective effects of TTX and verapamil on the upstroke components of the action potential from the atrioventricular node.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D009200:Myocardial Contraction / Q000187:drug effects*; D011817:Rabbits; D012849:Sinoatrial Node / Q000187:drug effects / Q000502:physiology*; D013779:Tetrodotoxin / Q000494:pharmacology*; D014700:Verapamil / Q000494:pharmacology*
chemical_list: D013779:Tetrodotoxin; D014700:Verapamil