The myosin heads relax into their low energy conformation, pulling the actin filaments toward the center of the sarcomere (causing all the sarcomeres along the myofibril to shorten, causing the myofibril to shorten, causing the muscle to shorten - or contract). Anaerobic production of ATP by glycolysis occurs during strenuous exercise after CP stores are exhausted. The myosin binding sites are blocked by a linear molecule of tropomyosin, which runs the length of the thin filament in the groove between the two chains.
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