• The Electron Transport Chain (ETC) is the final stage of aerobic cellular respiration and is responsible for generating the vast majority of ATP (Adenosine Triphosphate), the cell's primary energy currency.
• While glycolysis and the Krebs cycle produce a small amount of ATP directly (substrate-level phosphorylation), the ETC utilizes the energy from electron carriers (NADH and FADH2) produced in earlier stages to create a significant ATP yield through oxidative phosphorylation.
