Which of the following is a characteristic of fuel use by muscles?
A) At rest, about 90% of the fuel is derived from glucose.
B) At rest, about 90% of the fuel is derived from fat.
C) Muscles always use a mixture of fuels at rest or during physical activity.
D) During physical activity, amino acids contribute most of the fuel.
E) During the first 10 seconds of physical activity, the lactic acid system is the predominant source of energy.
Correct Answer:
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