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In the recent studies concerning the excitation-contraction coupling (E-C coupling) of muscles, the close relationship between the coupling process and both the plasma membrane and the intracellular structures joined to this membrane has been assumed (HUXLEY, 195913); MASHIMA, 195919)). Further, it is well known that glycerol is a constitutional member of lipid part in lipoprotein molecule, which is a constituent substance not only of the plasma membrane but also of the intracellular membrane systems (DANIELLI, 19585)). On the other hand, in the study of muscle contraction, glycerol treated muscles have been used widely (SENT-GYORGYI, 195124)) and are prepared by treating fresh muscles with glycerol solution of high concentration for a long time, so that the muscle membranes are considered to be completely destroyed, though the contractile elements are not suffered greatly (KOREY, 195015)). Considering these points, it could be expected that a short treatment of muscle with glycerol of a suitable concentration caused a moderate alteration of the plasma membrane of muscle cells and the joining structures to the membrane so that the alteration would give rise to some change in the E-C coupling

THE EXCITATION-CONTRACTION COUPLING OF THE SKELETAL MUSCLE AND THE ‘GLYCEROL EFFECT’