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Terms in this set (3)
Sliding filament model of contraction
states that during contraction, the thin filaments slide past the thick ones so that the actin and myosin filaments overlap to a greater degree
What are the steps of the sliding filament model of contraction?
1) when the NS stimulates muscle fibers, the myosin heads on the thick filaments latch onto myosin- binding sites on actin in thin filaments, and the sliding begins
2) these cross bridge attachments form and break several times during a contraction, acting like tiny rachets to generate tension and propel the thin filaments toward the center of the sarcomere
3) as this even occurs simultaneously in sarcomeres throughout the cell, the muscle cell shortens
At the microscopic level, what happens as the muscle cell shortens?
1) the I bands shorten
2) the distance between successive Z discs shortens. As the thin filaments slide centrally, the Z discs to which they attach are pulled TOWARD the M line
3) The H zones disappear
4) The contiguous A bands move closer together, but their length does not change
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