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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.
Glycolysis is the first step of cellular respiration, the process by which living cells break down glucose into small, energy-containing molecules called ATP. In glycolysis, a single glucose molecule breaks down into two molecules of pyruvate, which can then be broken down further to release ATP.