[Campbell Biology P.1179] Which of the following statements accurately differentiates oxidati... | Practice Question
Which of the following statements accurately differentiates oxidative muscle fibers from glycolytic muscle fibers, according to the text?
A: Oxidative fibers have fewer mitochondria than glycolytic fibers.
B: Glycolytic fibers are richer in myoglobin and have a darker appearance due to their high oxygen-storing capacity.
C: Oxidative fibers primarily rely on aerobic respiration and are specialized for sustained activity, while glycolytic fibers primarily use glycolysis and are better suited for quick, powerful contractions.
D: Glycolytic fibers have a smaller diameter and more extensive blood supply compared to oxidative fibers.
Explanation
The text states that 'Oxidative fibers... rely mostly on aerobic respiration' and 'are specialized in ways that enable them to make use of a steady energy supply,' implying sustained activity. In contrast, 'glycolytic fibers use glycolysis,' implying anaerobic respiration for quick, powerful bursts.