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The three stages of cellular respiration are glycolysis, the Krebs  Cycle, and the electron transport chain. The first stage happens in  the cytoplasm while the last two occâ¦urs in the mitochondria. 1 person found this useful.
So the citric acid cycle, specifically the acetyl CoA attaching to the 4-carbon molecule oxaloacetate is the first stage of cellular respiration that occurs in the mitochondria. Check.