Fast Glycolytic Muscle Fibers Depend on Carbohydrate as a Fuel

question 64

Multiple Choice

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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