Discussion
FTA fibers are..........................
Answer: C
FTa fibres are oxidative-glycolytic.
Skeletal muscle fibres are classified as slow-twitch (type I), which are oxidative, and fast-twitch (type II). The fast-twitch type IIa (FTa) fibres are fast oxidative-glycolytic: they contract quickly and can produce energy both aerobically and anaerobically, so they are fairly resistant to fatigue.
The fast-twitch type IIx (or IIb) fibres, FTb, are the purely glycolytic ones, powerful but quick to tire. Purely oxidative describes slow-twitch fibres, and FTa fibres are a well-defined type, so 'unclassified' does not fit them.
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