Muscles contraction mechanism #biology# explain
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Muscles contraction mechanism #biology# explain
Muscle contraction occurs when actin (thin filaments) and myosin (thick filaments) interact inside muscle fibers. A nerve impulse reaches the muscle and releases calcium ions (Ca²⁺). Calcium binds to troponin, causing tropomyosin to move away from the binding sites on actin. Myosin heads attach to actin, forming cross-bridges using energy ...
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