biochemistry question

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aspiringmd1015

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In biochem, obviously known rbcs undergo anaerobic glycolysis, and has to continue forming NAD to keep the cycle going, but it also says the rbc generates nadh through the pathway to give its electron to the fe3+ to make it fe2+ once again bc to prevent spontaneous methemoglobin production which makes perfect sense, but now where does the second nadh come from for pyruvate be reduced to lactate?