Zelda is a marathon runner. She completes the marathon in 2 hours and 30 minutes. Which of the following is true regarding her fuel use during the marathon?
A. If she runs out of muscle glycogen at the 2-hour mark, she will not feel fatigue.
B. Amino acids may supply up to 10% of energy needs.
C. Anaerobic glucose breakdown, using muscle glycogen, will provide most of the ATP for the marathon.
D. Liver glycogen is the preferred fuel during intense muscular activity lasting less than 2 hours.
Answer: B
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