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New skeletal muscle is generally not produced after the body has fully matured. The number of individual muscle cell fibers does not change throughout life. Take Arnold Schwarzenegger for example, before he developed, and after he lost, his Olympian physique he had the same number of muscle cells throughout the entire time, even to his 'saggy' present day condition. When muscles become larger or smaller, as seen from the exterior of the body, they only change in thickness, not in number.

Through the division and fusion of satellite cells

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11y ago

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