Muscles contract by myosin heads at both ends of the thick…
Muscles contract by myosin heads at both ends of the thick filament attaching to actin and progressively pulling the thin filaments toward the M-line. This overlapping of the thick and thin filaments is the basis of muscle contraction: The thin filaments are ratcheted in, bringing the Z-discs closer together and shortening the sarcomere. If enough sarcomeres contract, all the myofibrils and subsequently the muscle fiber will shorten, and ultimately the entire muscle belly follows suit. This process of a muscle contraction is called the
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