This infographic explains how the Electron Transport Chain (ETC) in mitochondria converts energy from NADH and FADH₂ into ATP. As electrons move through protein complexes, protons are pumped across the inner mitochondrial membrane, creating a proton gradient. Oxygen acts as the final electron acceptor, forming water, while the return flow of protons through ATP synthase drives the production of a massive yield of ATP (about 30–34 ATP), powering cellular activities. #ElectronTransportChain #Cellu