During vigorous exercise the lactate produced in the muscle travels to the liver for recycling. Explain why starting with lactate is beneficial for the liver gluconeogenesis pathway.
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Why is lactate formed in the muscle converted to glucose in the liver?
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Lactic acid (lactate) is often considered to be a metabolic waste, an unusable end product of anaerobic respiration. However liver cells produce an enzyme, lactate dehydrogenase, which reverses the fermentation reaction and produces pyruvate out of lactate. What benefit might this serve for the organism?
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When conditions in a muscle become anaerobic during strenuous exercise, why is it necessary to convert pyruvate to lactate? a. to decrease $\mathrm{NAD}^{+}$ and increase $\mathrm{NADH}$ b. to decrease NADH and increase NAD $^{+}$ c. to increase NADH and increase NAD $^{+}$ d. to decrease NADH and decrease NAD $^{+}$ e. to keep oxidative phosphorylation running
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