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The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin. ... ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur.
Relaxation. The calcium pump allows muscles to relax after this frenzied wave of calcium-induced contraction. ... Powered by ATP, it pumps calcium ions back into the sarcoplasmic reticulum, reducing the calcium level around the actin and myosin filaments and allowing the muscle to relax.
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