Cardiac conditional reflexes can be formed to pain but not to acetylcholine.
D000109:Acetylcholine / Q000494:pharmacology*; D003214:Conditioning, Classical; D006321:Heart / Q000502:physiology*; D006801:Humans; D010146:Pain; D012018:Reflex
D000109:Acetylcholine
ACETYLCHOLINE/effects; HEART/physiology; REFLEX, CONDITIONED