Electron Transport Chain:

1. The final step of cellular respiration is the transfer of electrons on an electron transport chain. In this step, the energy carried by electrons is used to synthesize ATP.
2. In the Electron transport Chain NAD and FADH₂ release electrons and hydrogen ions. These electrons are taken up by a series of electron carriers. When electrons move through a series of electron carriers, they lose energy, which is used to synthesize ATP molecules.
3. At the end of the chain electrons and hydrogen ions combine with molecular oxygen and form water.