Question

what type of muscle fiber is fatigable, and has less myoglobin, a poorer blood supply, and a more extensive sarcoplasmic reticulum than the other categories of fibers?

○ fast - twitch glycolytic fibers
○ slow - twitch glycolytic fibers
○ slow - twitch oxidative fibers

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Explanation:

Fast - twitch glycolytic fibers are fatigable, have less myoglobin, a poorer blood supply, and a more extensive sarcoplasmic reticulum compared to other fiber types. Slow - twitch fibers (both glycolytic and oxidative) have better oxygen - related properties and are more fatigue - resistant.

Answer:

A. Fast - twitch glycolytic fibers