The Electron Transport Chain: Complexes I and II

The video tutorial explains the roles of complexes one and two in the mitochondrial respiratory chain. Complex one, known as NADH dehydrogenase, oxidizes NADH to NAD, transferring electrons to coenzyme Q, and pumps protons into the inner membrane space. Complex two, or succinate dehydrogenase, is part of the TCA cycle and transfers electrons from succinate to FAD, forming FADH2, which then reduces coenzyme Q. Both complexes contribute to the ubiquinol pool, which is processed by complex three.

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