In the electron transport chain, oxygen serves as the final electron acceptor.
The primary cellular energy source, adenosine triphosphate, is created by the electron transport chain. Adenosine triphosphate is produced when oxygen serves as the final electron acceptor in a chain that helps transport electrons. If there was no oxygen in the mitochondrion, the electron transport chain would stall out and be unable to remove the electrons from the system. By doing this, the mitochondria would be unable to produce fresh ATP, and the cell would eventually run out of energy and die.
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