Step-by-step explanation:
When electrons in the electron transport chain lose energy, the energy is transferred through a series of redox reactions in a process known as oxidative phosphorylation. The energy is used to move protons across the inner mitochondrial membrane, creating an electrochemical gradient. This potential energy is then used to form ATP, which serves as the cell's main energy source. Additionally, the electrons that are lost in the electron transport chain are taken up by oxygen molecules in the mitochondria, forming water molecules in the process. The electrons are also used to break down glucose molecules, releasing energy that can be used by the cell for various processes.