Fast-Twitch Fibers Differ from Slow-Twitch Fibers in That

Multiple Choice

Fast-twitch fibers differ from slow-twitch fibers in that

A) they are more common in the leg muscles of champion sprinters than marathon runners.
B) they have more mitochondria.
C) they fatigue less rapidly.
D) their abundance is more a product of training than of genetics.
E) they are more common in postural muscles than in finger muscles.