Abstract
When muscles are treated with veratrine, repetitive excitation occurs in the muscle. The present paper deals with the cycle of the repetitive excitation thus occurred.
In the present experiments, several muscle bundles of sartorius muscle of Bufo vulgaris which were prepared by separating the muscle along the direction of the muscle fibres, were employed. Each of the muscle bundles was fixed to 5 separating chambers, and 10-4 veratrine was applied to its pelvic end and single stimulus was given to its tibial end thereafter. The action potential was led from the middle portion of the muscle to determine the cycle of the repetitive excitation of the muscle treated with veratrine. Interval diagrams were thus prepared. Further, various other determinations were conducted basing on the results of the above experiments to presume the location of the point where the repetitive excitation occur in the portion of the muscle to which veratrine was applied
