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Oct 5, 2021 at 20:16 vote accept Anwar Elhadad
Oct 4, 2021 at 20:01 comment added GT Electronics The electrons are coming from the "reduction and oxidation "half cells" created as the metallic form ionizes and dissolves into the electrolyte and a very small amount of chloride ion in the salt is reduced to chlorine (Cl2) which likely is some small it stays dissolved in your electrolyte so you don't readily smell or see it as a gas. You can get a general chemistry test book and look up electrochemical batteries and a table of "reduction potentials". From there you can calculate the voltage produced by various half-cell pairs (a reduction and an oxidation).
Oct 4, 2021 at 12:38 comment added Elliot Alderson @AnwarElhadad The electrons are all the same...nothing in your system is creating electrons. The correct question is "Where is the voltage coming from?" and I think this answer sums it up pretty well.
Oct 4, 2021 at 12:19 comment added Anwar Elhadad any metal connected to your biological system can create a "battery" ! Are those electrons coming from the metallic clips or from the bio-system?
Oct 4, 2021 at 11:37 history answered GT Electronics CC BY-SA 4.0