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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 major step in cellular respiration is glycolysis (see the figure on the top of. page 2): 1 glucose 2 pyruvate + 2 ATP. What happens next depends on whether or not oxygen is available to the cells.