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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.
The first part of cellular respiration is called glycolysis, in which glucose is broken into pieces called pyruvate. Next, the Krebâs cycle breaks down the carbon bonds and produces the waste gas that animals exhale, carbon dioxide. The final step in the cycle is called electron transport and oxidative phosphorylation.