The electrons that enter the transport chain come from NADH and FADH.
The electron transport chain accepts energy-rich electrons from NADH and FADH 2 whereas ATP is produced in the previous reactions of aerobic respiration. These processes such as glycolysis, the citric acid cycle, the fatty acid beta-oxidation metabolism, and the oxidation of amino acids occurs before electron transport chain. These processes do the function of transfer of electrons and protons to coenzymes.
So we can conclude that the electrons that enter the transport chain come from NADH and FADH.
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