What difference between slow twitch and fast twitch muscle fibers relates most to their difference in function? A. Fast twitch fibers have a richer blood supply than slow twitch fibers. B. Slow twitch fibers contain more mitochondria than fast twitch fibers. C. Slow twitch fibers do not require oxygen for energy, but fast twitch fibers do. D. Fast twitch fibers are found in large muscles, unlike slow twitch fibers.
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Which is a characteristic of fast-twitch muscle fibers? A. They contain more myoglobin than slow-twitch fibers. B. They are resistant to fatigue. C. They have fewer mitochondria than slow-twitch fibers. D. They require high amounts of oxygen in order to function.
Fast-twitch fibers differ from slow-twitch fibers in that $a$. they are more common in the leg muscles of champion sprinters than marathon runners. b. they have more mitochondria. $c$ they fatigue less rapidly. $d$. their abundance is more a product of training than of genetics. e. they are more common in postural muscles than in finger muscles.
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