MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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During muscle contraction, Z-lines of the sarcomere unit are
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pulled outwards thereby increasing the length of sarcomere
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compressed perpendicularly thereby decreasing height of sarcomere
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elongate perpendicularly thereby increasing height of sarcomere
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pulled inwards thereby causing shortening of sarcomere
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Explanation:
Detailed explanation-1: -The actin filaments are attached to Z discs, each of which marks the end of a sarcomere. The sliding of the filaments pulls the Z discs of a sarcomere closer together, thus shortening the sarcomere. As this occurs, the muscle contracts.
Detailed explanation-2: -Sliding Filament Model of Contraction For a muscle cell to contract, the sarcomere must shorten. However, thick and thin filaments-the components of sarcomeres-do not shorten. Instead, they slide by one another, causing the sarcomere to shorten while the filaments remain the same length.
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