Discussion
Which of the following is not a source of energy in active muscle cells?
Answer: C
Correct answer: Lactic acid
In the classical account, lactic acid is the waste product of anaerobic glycolysis in muscle, not a fuel - it is carried to the liver and reconverted to glucose in the Cori cycle. The energy sources are ATP itself, creatine phosphate for the first few seconds, and glucose thereafter. (Modern work shows lactate can be oxidised as a fuel by heart and by resting muscle, but that is not the sense intended here.)
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