What is the main energy source or fuel for skeletal muscle contraction?
a. Potassium
b. Lactic acid
c. Adenosine triphosphate (ATP)
d. Actin
ANS: C
Skeletal muscle requires a constant supply of ATP and phosphocreatine. These substances are necessary to fuel the complex processes of muscle contraction. Neither potassium, lactic acid, nor actin is the main energy source for muscle contraction.
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