Acetylcholine-atropine antagonism on the refractory period of the dog atrium in situ.
D000109:Acetylcholine; D000368:Aged; D000818:Animals; D001285:Atropine / Q000494:pharmacology*; D018680:Cholinergic Antagonists; D004285:Dogs; D006321:Heart / Q000494:pharmacology*; D006325:Heart Atria; D006801:Humans
D018680:Cholinergic Antagonists; D001285:Atropine; D000109:Acetylcholine
ACETYLCHOLINE/antagonists; ATROPINE/pharmacology; HEART/pharmacology