Electron Transport Chain Explained: Mechanism, Complexes & ATP

Fig. 1. Mitochondria have a double-membrane structure with an outer membrane, inner membrane, and an internal matrix (Kelvinsong; modified by Sowlos, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons)

Fig. 1. Electron flow through the mitochondrial electron transport chain showing complexes I–V, proton translocation across the inner membrane, and ATP synthesis via ATP synthase. (Fvasconcellos, Public domain, via Wikimedia Commons)