What triggers the contraction of skeletal muscles?

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Contraction occurs when calcium is absorbed by the sarcoplasmic reticulumContraction happens as actin and myosin filaments become shorterContraction begins when calcium attaches to troponinContraction starts when calcium binds to tropomyosin

Explanation

Skeletal muscle contraction is initiated when calcium ions bind to troponin, causing a conformational change that allows actin and myosin interaction. Calcium uptake by the sarcoplasmic reticulum stops contraction, and filaments themselves do not shorten but slide past each other.