PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Identify what occurs during the Sliding Filament Model.
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When the nervous system stimulates muscle fibers, the myosin on the thick filaments latch onto actin of thin filaments to begin sliding.
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The attachment forms and breaks multiple times during a muscle contraction to generate tension and propel thin filaments toward center of sarcomere.
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All sarcomeres in the cell slide simultaneously to make the muscle cell shorten.
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The myosin on the thin filaments latch onto actin of thick filaments to begin sliding.
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Explanation:
Detailed explanation-1: -Sliding-filament model of muscle contraction. The actin filaments slide past the myosin filaments toward the middle of the sarcomere. The result is shortening of the sarcomere without any change in filament length.
Detailed explanation-2: -The sliding filament model of muscle contraction describes how muscles generate force and produce movement. Muscle contraction occurs as a result of the sliding of thin filaments (actin) over thick filaments (myosin) within muscle fibers.
Detailed explanation-3: -Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts.
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