What happens to the charge during the stimulation?

Depending on how we configure the polarity, the stimulator will discharge either cations or anions into the body part being stimulated. In cathodal stimulation,anions are discharged into the body as current flows from the cathode, through the tissue, and back to the anode.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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well we can't tell you because we cant see the time give a screen shot or something.