Glucose metabolism changes in the cell depending on whether the cell has access to oxygen or lacks oxygen.
In a muscle cell with oxygen supplies, the aerobic metabolism of glycolysis will be used, the generated pyruvate is degraded to CO2 and H2O through oxidative decarboxylation and the Krebs cycle.
In a muscle cell with little access to oxygen, anaerobic metabolism is used, in which the pyruvate generated by glycolysis is reduced to lactate by the enzyme lactate dehydrogenase, giving lactic acid.
Thanks to these two types of cells in muscle tissue, even without oxygen, the muscle can respond to situations where it has a high demand and little access to oxygen (such as in flight situations or during intense exercise).
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