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Complete Question:
The primary (not the 'initial') fuel during endurance exercise is:
A. Liver glycogen
B. Fatty acids
C. Muscle glycogen
D. Electrolytes
E. None of the above
Answer:
B. Fatty acids
Explanation:
Fat is one of the nutrients present in foods that humans consume. This fat is stored in the body.
When a human undergoes an endurance exercise, the fat that is stored in the body is converted and broke down to form fatty acids.
The blood then transport this fatty acids to the muscles to be used as the primary source of fuel during an endurance exercise.
