Jennifer has signed up for a jogging class this term.By the end of the term,it is likely that:
A) none of Jennifer's muscle fibers will change type.
B) some of her Type IIa fibers will be converted into Type IIb fibers.
C) some of her Type IIb fibers will be converted into Type IIa fibers.
D) some of her Type II fibers will be converted into Type I fibers.

Question

Quizplus · Accepted Answer

During endurance exercises such as jogging, the body tends to shift towards utilizing slow-twitch muscle fibers (Type I) as they are more efficient at utilizing oxygen for energy. This means that some of Jennifer's Type IIb fibers may convert into Type IIa fibers, which have more oxidative capabilities and are better suited for endurance exercises. However, it is unlikely that any of her muscle fibers will convert from Type II to Type I, as they have vastly different characteristics and purposes.

Jennifer Has Signed Up for a Jogging Class This Term