ELECTRICAL POTENTIALS OF THE HEART OF THE CHICK EMBRYO

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Abstract
The potential distr. around the primitive cardiac tube of the chick embryo is of a type similar to that found in the adult vertebrate heart. The disposition of electrical charges within this structure which are responsible for these potential changes is thus similar to that in the adult organ. This distr., characteristic of heart muscle, is present before the muscle has acquired the histological structure of adult muscle and at a time when the whole organ consists of a simple tube of nearly uniform diam. The fundamental basis for the characteristic cardiac potentials and the electro-cardiagram is thus acquired as early in development as the properties of automaticity and contractility.

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