THE VALIDITY OF THE ELECTRICAL DOUBLET THEORY OF THE CARDIAC ACTION CURRENT

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Abstract
Action currents were recorded from an immersed turtle heart muscle strip, electrically stimulated at one (the proximal) end. Three derivations were used, namely, proximal to soln., proximal to distal, distal to soln. In the last derivation, the action current record did not begin shortly after stimulation, as demanded by the negativity theory, but only when the impulse came close to the distal contact. In the second derivation, 2 pairs of initial deflections were recorded, which were not connected by a plateau as demanded by the negativity theory. The facts support the electrical doublet theory.

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