Consulting Figure 7.3 if necessary, during which stage(s) of cellular respiration is carbon dioxide released?

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Carbon dioxide is released during stages 2 and 3 of cellular respiration. In stage 2, pyruvate is oxidized to produce acetyl CoA, and carbon dioxide is released. In stage 3, the Krebs cycle produces more carbon dioxide as it breaks down acetyl CoA. Carbon dioxide is not released in stage 1 or stage 4.