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The contraction process involves five interlocking steps: 1) Nerve Signal - A motor neuron sends an action potential to the muscle fiber, releasing acetylcholine at the neuromuscular junction. 2) Calcium Release - This signal triggers the sarcoplasmic reticulum to release calcium ions into the muscle cell. 3) Cross-Bridge Formation - Calcium binds to troponin, causing tropomyosin to shift and expose binding sites on actin for myosin heads to attach. 4) Power Stroke - Myosin heads pivot, pulling actin filaments toward the center of the sarcomere and shortening the muscle. 5) Relaxation - ATP binds to myosin, causing it to release actin, and calcium is pumped back into the sarcoplasmic reticulum, allowing the muscle to relax.
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