Which Statement About Fast-Twitch and Slow-Twitch Fibers Is True

Multiple Choice

Which statement about fast-twitch and slow-twitch fibers is true?

A) In skeletal muscle, the most important factor determining the proportion of fast- and slow-twitch fibers is physical training.
B) Aerobic training increases the oxidative capacity of intermediate fibers.
C) A single muscle cell may contain fast- and slow-twitch fibers.
D) Fast-twitch fibers fatigue slowly.
E) Champion sprinters are likely to have a high proportion of slow-twitch fibers in their legs.