title: Influence of membrane potential and ionic currents on mechanical activity of frog sino-atrial fibres. Existence of two components.
mesh_terms: D000818:Animals; D001001:Anura; D002118:Calcium / Q000494:pharmacology; D006329:Heart Conduction System / Q000502:physiology*; D008094:Lithium / Q000494:pharmacology; D008345:Manganese / Q000494:pharmacology; D008564:Membrane Potentials; D012964:Sodium / Q000494:pharmacology
chemical_list: D008345:Manganese; D008094:Lithium; D012964:Sodium; D002118:Calcium