How do muscles contract and realx ?
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A multistep molecular process within the muscle fiber begins when acetylcholine binds to receptors on the muscle fiber membrane. The proteins inside muscle fibers are organized into long chains that can interact with each other, reorganizing to shorten and relax.
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When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins: ... The calcium ions diffuse into the muscle fiber. The relationship between the chains of proteins within the muscle cells changes, leading to the contraction.
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