Fast fibers
A) have high resistance to fatigue.
B) have a high concentration of myoglobin.
C) have many mitochondria.
D) contract quickly.
E) all of the above

Question

Quizplus · Accepted Answer

Fast fibers are also known as type II fibers and contract quickly, but have low resistance to fatigue. They have a lower concentration of myoglobin and fewer mitochondria compared to slow fibers (type I fibers). So, option D is the correct answer.

Fast Fibers