Word Count : 301

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The Electron Transport Chain (ETC) is a series of protein complexes and small molecules embedded in the inner mitochondrial membrane that transfer electrons from electron donors like NADH and FADH₂ to oxygen, the final electron acceptor, generating a proton gradient that drives ATP synthesis. The main components of the ETC include Complex I (NADH dehydrogenase), Complex II (succinate dehydrogenase), Coenzyme __________ __________ _____ _____ _____ _______ __________.
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