title: Proceedings: Regulation of tonic tension in frog atrial muscle by voltage-dependent Na-Ca exchange.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D006321:Heart / Q000502:physiology*; D009129:Muscle Tonus; D012964:Sodium / Q000378:metabolism*
chemical_list: D012964:Sodium; D002118:Calcium