Muscles are made of fibers that contract to produce movement. There are three main types of muscle fibers: skeletal, smooth, and cardiac, each serving different functions. These fibers are crucial for both voluntary and involuntary movements in the body. ;
Muscles are made of fibers that contract for movement, including skeletal, smooth, and cardiac fibers. Skeletal fibers allow voluntary movement, while smooth and cardiac fibers operate involuntarily. The correct answer is C. Fibers.
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