During the transfer of electrons from Complex I to Q (Coenzyme Q) the Complex I is OXIDIZED because it LOSES electrons and Q is REDUCED because it GAINS electrons.
The oxidation-reduction reactions involve the transfer of electrons between two species.
The mitochondrial Complex I (also called NADH-Coenzyme Q reductase) is the first enzyme of the electron transport chain of cellular respiration.
This complex (Complex I) oxidizes NADH generated through the Krebs cycle and uses the two electrons to reduce ubiquinone (Coenzyme Q) to ubiquinol.
In conclusion, during the transfer of electrons from Complex I to Q (Coenzyme Q) the Complex I is OXIDIZED because it LOSES electrons and Q is REDUCED because it GAINS electrons.
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