title: The effect of external calcium ions on the excitation-contraction coupling in single muscle fibres of the crayfish.
mesh_terms: D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D003445:Crustacea; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects*; D009210:Myofibrils / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology
chemical_list: D011188:Potassium; D002118:Calcium