Muscles that are constantly active,such as those maintaining our body posture,have a high proportion of

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Muscles that are constantly active, such as those maintaining our body posture, have a high proportion of slow, fatigue-resistant fibers. This is because these muscles need to be able to sustain contractions for extended periods of time without tiring or fatiguing. Slow, fatigue-resistant fibers are better suited for this type of sustained activity compared to fast, fatigue-susceptible fibers.

Muscles That Are Constantly Active,such as Those Maintaining Our Body