Fast Glycolytic Muscle Fibers Depend on Carbohydrate as a Fuel

Fast glycolytic muscle fibers depend on carbohydrate as a fuel, whereas slow oxidative fibers are capable of metabolizing carbohydrates, lipids, or amino acids. What is the physiological reason for this difference?

A) Anaerobic glycolysis can produce ATP from glucose much more quickly than lipid or amino acid oxidation can take place.
B) The myosin in fast glycolytic fibers can only bind to glycogen.
C) Compared to fast glycolytic fibers, slow oxidative fibers need to metabolize a wider variety of fuels to meet a higher ATP demand.
D) Slow oxidative fibers need to metabolize lipid because they have less creatine kinase.

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