Skeletal muscle fibers that contain large numbers of mitochondria and myoglobin could be classified as
A) type I fibers
B) type IIa fibers
C) either type I or type IIa
D) type IIx

Question

Quizplus · Accepted Answer

Type I fibers are slow-twitch fibers with high endurance, containing many mitochondria and myoglobin. Type IIa fibers are fast-twitch but also have a significant amount of mitochondria and myoglobin, allowing for both endurance and power.

Skeletal Muscle Fibers That Contain Large Numbers of Mitochondria and Myoglobin