title: The relationship between the external calcium concentration and the contracture tension developed by auricular trabeculae isolated from the heart of the frog, Rana pipiens.
mesh_terms: D000818:Animals; D001001:Anura; D002118:Calcium / Q000494:pharmacology*; D006321:Heart / Q000502:physiology*; D006325:Heart Atria / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects*; D011955:Receptors, Drug
chemical_list: D011955:Receptors, Drug; D002118:Calcium