Suppose you take a muscle biopsy from an elite athlete and perform a histological analysis on the sample. You find that the muscle cells are relatively small in diameter, contain high numbers of mitochondria, and have an unusually large proportion of Type IIa myosin. The athlete is most likely a

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Type IIa muscle fibers are fast-twitch fibers that are more resistant to fatigue than Type IIb fibers and are suited for middle-distance events like the mile run, where both speed and endurance are important.

Suppose You Take a Muscle Biopsy from an Elite Athlete