Which of the following is NOT a red blood cell metabolic pathway?

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Multiple Choice

Which of the following is NOT a red blood cell metabolic pathway?

Red blood cells rely on cytosolic energy and redox pathways because they lack mitochondria. The Embden-Meyerhof-Parnas pathway is the classic glycolytic route that provides ATP in RBCs. The hexose monophosphate shunt, or pentose phosphate pathway, operates in erythrocytes to generate NADPH, helping keep hemoglobin in a reduced state and protecting against oxidative damage. The methemoglobin reductase pathway uses NADH to reduce methemoglobin back to hemoglobin. The citrate cycle, however, occurs in mitochondria and depends on mitochondrial enzymes and oxidative phosphorylation, which mature red blood cells do not have. Therefore, the citrate cycle is not a red blood cell metabolic pathway.

Red blood cells rely on cytosolic energy and redox pathways because they lack mitochondria. The Embden-Meyerhof-Parnas pathway is the classic glycolytic route that provides ATP in RBCs. The hexose monophosphate shunt, or pentose phosphate pathway, operates in erythrocytes to generate NADPH, helping keep hemoglobin in a reduced state and protecting against oxidative damage. The methemoglobin reductase pathway uses NADH to reduce methemoglobin back to hemoglobin. The citrate cycle, however, occurs in mitochondria and depends on mitochondrial enzymes and oxidative phosphorylation, which mature red blood cells do not have. Therefore, the citrate cycle is not a red blood cell metabolic pathway.

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