Unformatted text preview: bound to the thin filament, preventing slippage of the filaments during contraction. Note that the thin and thick filaments do not become shorter, but slide past each other and the amount of overlap of the filaments changes as the sarcomeres shorten -- a process known as the sliding filament theory of muscle contraction. Muscle cells shorten because their individual sarcomeres shorten, pulling the Z discs within the cell closer together. The myofilaments are attached to the plasma membrane via a protein known as dystrophin ; thus when they shorten due to the action of actin and myosin, they pull on the dystrophin and the plasma membrane of the muscle causing the contraction of the whole muscle cell....
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- Fall '10