What characteristics define a fast-twitch muscle fiber______________________?
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Answer: C. White muscle
Explanation
Fast-twitch muscle fibers are primarily white muscle fibers specialized for short, powerful bursts of speed. These fibers rely on anaerobic metabolism to generate rapid, explosive force during high-intensity athletic movements. Physiological analysis confirms that white muscle tissue dominates the muscular profile of elite sprinters and jumpers. Human skeletal muscle is composed of different fiber types tailored for endurance or explosive power activities. White muscle fibers fatigue quickly because they operate without relying heavily on steady oxygen delivery. Genetics largely determine the ratio of fast-twitch to slow-twitch muscle fibers in an individual's body.
Volleyball players, sprinters, and weightlifters heavily recruit fast-twitch muscle fibers for jumping and spiking. Training programs designed to build explosive power focus on stimulating these specific white muscle tissues. Sports scientists measure fiber composition to help athletes choose sports suited to their natural physiological traits. Option A refers to red muscle, which describes slow-twitch fibers specialized for long-duration endurance. Option B is incorrect because fast-twitch fibers are specifically associated with white muscle tissue. Option D is incorrect because red muscle fibers do not share the explosive characteristics of fast-twitch tissue.
- Subject
- Physical Education
- Category
- Physical Education
- Topic
- —
- Difficulty
- medium
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