Abstract
Material was exclusively the cardiac muscle strip prepared from the heart of Japanese toad (Bufo vulgaris) . The strip stimultated at its one end and the evoked action potential was led from middle portion and other end portion through silver electrodes, and recorded by cathode ray oscilloscope.
In this way the propagation of the excitatory wave in the relative refractory period was investigated.
As the conclusion of the experiment, the authors are in opinion that the immature action potential, evoked at the cathode of stimulating electrode in the refractory state of the cardiac muscle, is very probable to propagate decrementally along it.
