At low power demands, which fiber type is predominantly recruited?

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Multiple Choice

At low power demands, which fiber type is predominantly recruited?

Explanation:
When muscles are asked to produce small, steady force, the body uses the smallest, fatigue-resistant motor units first. Those are the slow-twitch, Type I fibers. They’re rich in mitochondria, have high capillary density, and rely on oxidative metabolism, which gives them great endurance with low fatigue. Because they contract more slowly and generate less force, they’re activated before the larger, faster fibers. As the demand for power increases, the nervous system progressively recruits larger motor units such as Type II fibers. So for low power, Type I fibers carry the majority of the work.

When muscles are asked to produce small, steady force, the body uses the smallest, fatigue-resistant motor units first. Those are the slow-twitch, Type I fibers. They’re rich in mitochondria, have high capillary density, and rely on oxidative metabolism, which gives them great endurance with low fatigue. Because they contract more slowly and generate less force, they’re activated before the larger, faster fibers. As the demand for power increases, the nervous system progressively recruits larger motor units such as Type II fibers. So for low power, Type I fibers carry the majority of the work.

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