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The citric acid cycle is located in the mitochondrial matrix. It reduces NAD+ (and FAD) to NADH (and FADH2). These reduced electron carriers then shuttle their electrons to the ETC, and become oxidized back to NAD+ (and FAD) to return to the citric acid cycle. With the ETC all backed up, NADH (and FADH2) have nowhere to dump their electrons, and can't cycle back to their oxidized forms. Without NAD+, the citric acid cycle stops.

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