The determination of the histamine equilibrium constant for its receptor in the smooth muscle by changing the extracellular calcium concentration.
D000818:Animals; D002118:Calcium / Q000032:analysis*; D006168:Guinea Pigs; D006632:Histamine / Q000008:administration & dosage / Q000494:pharmacology*; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D008433:Mathematics; D009130:Muscle, Smooth / Q000187:drug effects; D011955:Receptors, Drug
D011955:Receptors, Drug; D006632:Histamine; D002118:Calcium