option a- True. Actions, such as walking and sprinting, are taken care by the fast oxidative-glycolytic fibers of the muscle system.
Intermediate fibers are fast twitch muscle fibers that have been converted through endurance training. They are also known as fast oxidative-glycolytic fibers. These fibers have a slightly larger diameter, more mitochondria, a larger blood supply, and greater endurance than typical fast twitch fibers. Fast oxidative (FO) fibers have fast contractions and primarily use aerobic respiration, but they can fatigue faster than SO fibers because they can switch to anaerobic respiration (glycolysis). Finally, fast glycolytic (FG) fibers contract quickly and primarily use anaerobic glycolysis. The FG fibers wear out faster than the others.
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