Abstract
The effect of tetraethyl-ammonium ion on the action potential of the cardiac muscle was investigated. Materials were the ventricle of the toad's heart exclusively. For the measurement of the membrane potential and action potential, supermicroelectrod was utilized. When the heart was immersed in the TEA-Ringer solution, the action potential was reduced in its amplitude and the plateau part disappeared, but the change of the duration was the minimum. And such a change was reversible.
