The citric acid cycle serves as the final common pathway where the electrons extracted from hydrogen pass to oxygen.

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The citric acid cycle (also known as the Krebs cycle or TCA cycle) is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats, and proteins into carbon dioxide. However, it is not the final pathway where electrons pass to oxygen; that role belongs to the electron transport chain, where the electrons extracted during various metabolic processes, including the citric acid cycle, are ultimately transferred to molecular oxygen, producing water.

The Citric Acid Cycle Serves as the Final Common Pathway