Flowchart of the Three Stages of Cellular Respiration
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Flowchart of the Three Stages of Cellular Respiration
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End: little energy released; products are lactate / alcohol
Yes (aerobic)
Anaerobic respirationPyruvate → lactate or alcohol + CO₂Only glycolysis yields 2 ATP
Stage 2: citric acid cycleSite: mitochondrial matrix2 pyruvate → 6 CO₂ + abundant [H]Produces 2 ATP
Oxygen sufficient?
Pyruvate enters the mitochondrionDecarboxylation forms acetyl-CoAReleases 2 CO₂
End: energy fully released
Stage 1: glycolysisSite: cytoplasmGlucose → 2 pyruvate + [H]Net 2 ATP (4 produced − 2 consumed)
Glucose C₆H₁₂O₆
No (anaerobic)
Stage 3: electron transport chainSite: inner mitochondrial membrane[H] + O₂ → H₂OProduces 26–28 ATP (main energy yield)
Total: per glucose moleculeabout 30–32 ATP + 6 CO₂ + 6 H₂O
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