I’m more picturing a bucket brigade. The mitochondria have a series of proteins that hands the electron down the chain using a portion of the potential energy to do something. The first protein takes an electron and passes it down a chain, if the last guy quits taking buckets the whole chain stops.
I used the example of a wire because everybody is familiar with a wire. If you disconnect one end, the electron flow stops, same with a series of proteins that convert power from a flowing electron into useful chemical energy.
Electrons don’t flow in wires (small migration may occur, but not ionic conduction).
Electrical charge flows in wires.
Your Aluminum conductors in the high voltage lines don’t supply electrons to the copper conductors in your distribution system. We don’t see pileups of AlOxide or Copper Oxide on the buss bars. We observe electrical potential energy differences between buss bars.