Studies on the Irreciprocal Conduction of Excitation.

Report I. The Definition and Verification of Atypical Isodromical System

Abstract

From the standpoints of conduction of excitation and its direction, two indices have been obtainedexcitation conducted reciprocally. The livingsystems are classified into two system: (1) Typical isodromical systems, in which excitation is conducted reciprocally (2)heterodromical system in which excitation is conducted irreciprocally. It is ascertained that two systems are reversible, at least, under a certain conduction. Studies on the mechanisms of that reversibility have supported to assume that conduction of excitation shows the typical isodromical system in the initial stage, gradually changing into the heterodromical systems. Kotsuka designated this shifting as atypical isodromical system. Thus classifications are made of the all living systems into three conductionsystems of excitation.
Method: Hearts of frogs and toad were employed. The atrioventricular specimens in Ringer's Solution (lat. part. specimens or septum specimens) were prepared. Single stimulus was adopted. The experiments was performed with the assumption that contractivity and excitivity can not be separated. Then we measured and described the curve of the transmittionstime of excitationwaves.
Conclusion: It has been disclosed that there exists the atypical isodromical system.