[Campbell Biology P.1180] Which of the following statements correctly differentiates fast-twi... | Practice Question

Which of the following statements correctly differentiates fast-twitch glycolytic white muscle fibers from slow-twitch oxidative red muscle fibers, based on the provided text and table?

  • A: Fast glycolytic fibers primarily use aerobic respiration for ATP production, while slow oxidative fibers primarily use glycolysis.
  • B: Fast glycolytic fibers are rich in myoglobin and appear red, whereas slow oxidative fibers have low myoglobin and appear white.
  • C: Fast glycolytic fibers contract slowly and are resistant to fatigue, whereas slow oxidative fibers contract quickly and fatigue rapidly.
  • D: Fast glycolytic fibers have few mitochondria, while slow oxidative fibers have many mitochondria.

Explanation

According to Table 50.1, Fast-Twitch Glycolytic fibers have 'Few' mitochondria, and Slow-Twitch Oxidative fibers have 'Many' mitochondria. This directly correlates with their primary ATP source glycolysis vs. aerobic respiration and fatigue resistance.