Discuss the role of the myosin heads in sliding filament theory
What will be an ideal response?
The myosin heads attach to binding sites on the actin filaments to form cross bridges and to begin the process of sliding. The myosin heads swivel toward the center of the sarcomere, attaching and detaching several times which generates tension that helps pull the thin filaments toward the center of the sarcomere. This "walking" of the myosin heads along the thin filaments allows the thin filaments to slide past the thick filaments. As a result, the Z discs are pulled closer together. Since this event occurs simultaneously in sarcomeres throughout the cell, the muscle cell shortens.
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