What is the role of sarcomere in muscle contraction?
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Q&A
Explain the sliding filament theory of muscle contraction.
According to the sliding filament theory, contraction occurs when myosin heads form cross-bridges with actin filaments using ATP energy. Calcium ions bind to troponin, exposing actin sites. Actin filaments slide inward over myosin, shortening the sarcomere and causing contraction. The I-band shortens, A-band remains unchanged.
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