What is important about the mitochondria structure in cellular respiration?

https://study.com/academy/lesson/cellular-respiration-in-mitochondria.html

The electron transport chain is the final step in cellular respiration. It uses the electron carrier molecules NADH and FADH2 created during the Krebs cycle. ... Inside your mitochondria, the cell's energy producing organelle, there is a membrane. That membrane is called the inner mitochondrial membrane and it's important.

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