The first stage of cellular respiration, happens in the cytoplasm of your cells. In this procedure, a glucose molecule is split into two pyruvate molecules (pyruvic acid).
The three main stages of cellular respiration are glycolysis, the Krebs cycle (also known as the citric acid cycle), and oxidative phosphorylation in the electron transport chain. While glycolysis can happen under anaerobic conditions, the TCA cycle and oxidative phosphorylation require oxygen.
Glycolysis marks the beginning of cellular respiration. A 6-carbon molecule is broken down into two 3-carbon pyruvate molecules in the top box of Figure 5.9. 3 to illustrate this process.
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