So in the mitochondrial matrix, we have Pyruvate, which is transformed into acetyl coenzyme A via Pyruvate dehydrogenase complex. And this is the committed step. Once we form acetyl coenzyme A, it will be fed into the citric acid cycle where we produce the Nadhs and Fadh twos. And those high energy electrons on these molecules will move onto the electron transport chain on the inner membrane of the mitochondria to form those high energy ATP molecules. But under resting conditions, we don't want to generate these ATP molecules because we already have lots of these ATP molecules to begin with. And so we want to turn off this pathway.