electrons are removed from the external circuit of an electrolysis cell.?

Question

How and where is this done?

Answer 1

I think that what the question means is, where do the electrons go when the cell is operating? The answer is, that they go into carrying out the reduction. Thus if you electrolyse molten sodium chloride, you pull electrons off the chloride ions at the anode, and push them onto the cathode, where they are removed by the Na+ ions being reduced to metallic sodium.

Answer 2

Might be wrong, but you can have free radicals take up electrons. E.g. oxygen.