Which fiber type is slow-twitch and fatigue-resistant?

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Multiple Choice

Which fiber type is slow-twitch and fatigue-resistant?

Explanation:
Slow-twitch fibers are built for endurance and resist fatigue. They contract more slowly and generate less force, but they rely primarily on aerobic metabolism, supported by abundant mitochondria, rich blood supply, and high myoglobin content. That combination lets them produce ATP steadily over long periods, making them ideal for endurance activities like distance running or maintaining posture. The other fiber types are fast-twitch and designed for quick, powerful bursts; they rely more on glycolytic energy and tire more quickly. So the fiber type that is slow-twitch and fatigue-resistant is Type I.

Slow-twitch fibers are built for endurance and resist fatigue. They contract more slowly and generate less force, but they rely primarily on aerobic metabolism, supported by abundant mitochondria, rich blood supply, and high myoglobin content. That combination lets them produce ATP steadily over long periods, making them ideal for endurance activities like distance running or maintaining posture. The other fiber types are fast-twitch and designed for quick, powerful bursts; they rely more on glycolytic energy and tire more quickly. So the fiber type that is slow-twitch and fatigue-resistant is Type I.

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