Glycolysis occurs in the cytoplasm, while the Krebs Cycle and Electron Transport Chain happen in the mitochondria, producing ATP from glucose.
Glycolysis (Stage 1): Takes place in the cytoplasm, breaks down glucose into two 3-carbon molecules (pyruvate), and produces ATP. No oxygen is required.
Krebs Cycle (Stage 2) and Electron Transport (Stage 3): Take place in the mitochondria and require oxygen. Further breakdown of pyruvate occurs, resulting in the production of water, carbon dioxide, and a large amount of energy in the form of ATP.
Mitochondrion: Plays a crucial role in aerobic respiration, housing the Krebs Cycle and Electron Transport Chain.
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