Fast-twitch muscle fibers, such as those that predominate in the legs of sprinters, ____________than slow-twitch fibers, which predominate in the legs of marathon runners.
A) produce more ATP
B) have a greater blood supply
C) contain fewer mitochondria
D) contain higher levels of myoglobin

Question

Quizplus · Accepted Answer

Fast-twitch muscle fibers are designed for short bursts of power and speed, and as such, they contain fewer mitochondria compared to slow-twitch fibers, which are optimized for endurance and efficient energy use over longer periods.

Fast-Twitch Muscle Fibers, Such as Those That Predominate in the Legs