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Muscles perform their functions through contraction and relaxation, which is primarily driven by the interaction of proteins called actin and myosin within muscle fibers. When a muscle receives a signal from the nervous system, calcium ions are released, allowing myosin to bind to actin and pull it inward, resulting in contraction. This process requires energy in the form of ATP. Muscles work in coordinated groups to produce movement, stabilize joints, and maintain posture.

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