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, which causes a conformational change allowing actin and myosin interaction. Calcium uptake by the sarcoplasmic reticulum actually helps muscle relaxation, not contraction. The filaments themselves do not shorten; they slide past each other. Calcium does not bind to tropomyosin to start contraction.