Muscle cells working very hard run short of oxygen and produce lactate from pyruvate. What is the key benefit of this step?
Answer and explanation
Correct answer: C. It regenerates NAD+
- Step 1: Glycolysis needs NAD+ to keep running, and the electron transport chain cannot regenerate it without oxygen.
- Step 2: Converting pyruvate to lactate oxidises NADH back to NAD+, so glycolysis keeps producing 2 ATP per glucose.
Answer
it regenerates NAD+ so glycolysis continues.
Why not the others: Fermentation does not make extra ATP; it does not remove CO2; lactate is not converted to glucose in muscle itself.
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