title: Action of substance P and its natural analogs on the circular muscle of the guinea pig ileum.
mesh_terms: D000818:Animals; D001285:Atropine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006168:Guinea Pigs; D007082:Ileum / Q000502:physiology; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000502:physiology*; D010455:Peptides / Q000494:pharmacology*; D013373:Substance P / Q000031:analogs & derivatives / Q000494:pharmacology*; D015320:Tachykinins
chemical_list: D010455:Peptides; D015320:Tachykinins; D013373:Substance P; D001285:Atropine