Motor units that include Type IIb fibers
A) usually include Type IIa fibers as well.
B) produce about 100 times the force as units that include Type I fibers.
C) produce about one-third of the force produced by units that include Type IIa fibers.
D) are rarely found in humans.

Question

Quizplus · Accepted Answer

Type IIb fibers are fast-twitch fibers that generate a high amount of force, significantly more than Type I fibers, which are slow-twitch and endurance-oriented.

Motor Units That Include Type IIb Fibers