The citric acid cycle is a component of aerobic respiration. Molecular oxygen

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Molecular oxygen is not directly involved in the reactions of the citric acid cycle itself; it is used in the electron transport chain, which is downstream of the citric acid cycle. Oxygen's role is indirect in the sense that it is the final electron acceptor in the electron transport chain, which creates the gradient used to produce ATP. The citric acid cycle, also known as the Krebs cycle, primarily functions in the mitochondrial matrix to produce electron carriers (NADH and FADH2) that are then used in the electron transport chain.

The Citric Acid Cycle Is a Component of Aerobic Respiration