ACTION OF THE VAGUS NERVES ON THE CHRONAXIE OF THE AURICLES AND THE VENTRICLES OF THE TURTLE HEART; RELATIONSHIP TO CHROMOTROPIC CHANGES

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Abstract
Experiments on preparations of Chrysemys picta indicate that faradization of the right vagus nerve stops the contractions of the heart and, at the same time, diminishes the value of the chronaxie of the right auricle (and probably of the entire myocardium). The chronaxie of both auricles is likewise diminished during stimulation of the left vagus without any change in the rhythm, although the force of contractions may be appreciably diminished. Ventricular chronaxie is also diminished (confirming previous work) even when stimulation of the left vagus produces no change in the rhythm or decrease in the force of contractions. Consequently, the changes in chronaxie are due to a direct action of the vagus and are not a result of indirect chronotropic changes.

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