Which of the following describes Type I skeletal muscle fibers?
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Correct answer: Slow-twitch, oxidative, and rich in myoglobin
Type I fibers, also known as slow oxidative fibers, are specialized for endurance. They contain high amounts of myoglobin and mitochondria, allowing them to resist fatigue through aerobic metabolism.
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- In a histological section stained for ATPase activity, which fiber type would appear darkest at a high pH (9.4)?
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