Therapeutic Interventions Exam 2 Practice

Phasic, fast-twitch muscle fibers correspond to which type?

Type I Type II Type IIa Type IIx

Correct Answer:

Type II

Explanation:

Phasic, fast-twitch fibers are built for rapid, powerful contractions and fatigue quickly. This maps to the fast-twitch category, known as Type II. Type I fibers are slow-twitch and support sustained, endurance activities. Within the fast-twitch group are IIa and IIx, with IIa being fast-oxidative-glycolytic (somewhat more fatigue-resistant) and IIx being fast-glycolytic (fatigue the quickest). So, the best match for phasic, fast-twitch is Type II, since it covers the fast-twitch fiber family.

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