Muscle glycogen stores would be broken down during an exercise bout lasting several hours because ________.

A. exercising muscle can only utilize glucose for energy for long-term exercise
B. exercising muscle needs the fatty acids released from glycogen for energy
C. glycogen can enter the mitochondria and produce more ATP than glucose
D. exercising muscle utilizes both glucose and free fatty acids for energy during long-term exercise


Answer: D

Anatomy & Physiology

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