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Electrons travel from the anode to the cathode. So eventually, there will be to many electrons in the cathode, and there will be resistance to electron flow (because electrons don't like moving toward negative charge). This is when the salt bridge comes into action. The salt bridge will release positive ions to the cathode (because the cathode now has a overload of electrons) and negative ions to the anode (because the anode with time will lose a lot of electrons). This will restore the charge of the anode as negative and cathode as positive, and allow the galvanic cell to function for some time.
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