Biology / Unit 3 Bio 0552 worked example, 60 to 90 seconds
Steps of the Electron Transport Chain
Captions available
The idea
Four membrane-bound protein complexes carry electrons from NADH and FADH2 to oxygen in a fixed sequence, pumping hydrogen ions across the inner mitochondrial membrane at three of the four steps.
Where people slip
Losing Complex I's pump by entering through Complex II is why FADH2 yields fewer ATP per molecule than NADH does.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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