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Why is lactic acid produced during anaerobic respiration?

During anaerobic respiration, there is an insufficient amount of oxygen in the blood. Oxygen acts as the final electron acceptor after the electron has been passed down the electron transport chain (ETC) which is located in the intermembrane space (IMS) of the mitochondria. The ETC comes to a halt as reduced NAD from the Krebs cycle do not become re-oxidised. To combat this, pyruvate produced at the end of glycolysis accepts electrons from reduced NAD to reform NAD. Lactate is formed as pyruvate accepts electrons.

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