I am having trouble understanding how current can move through an electrolyte solution that does not contain ions of the metal of which the electrode supplying the current is made. For instance, if a silver wire were submerged in a solution of potassium chloride and, how would current pass into the solution? I am in a neurobiology lab and we use glass electrodes containing a silver wire in a potassium chloride solution to inject current into living cells. I have been struggling to understand how it is we are doing so. Any help would be appreciated.