During contraction of muscles,

Actin filament slide over actin

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Myosin filament slide over actin

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Actin filament slide over myosin

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None of the above

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Solution

The correct option is C Actin filament slide over myosin
Mechanism of muscle contraction is best explained by the sliding filament theory, which states that contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. The actin filament slide over myosin filament thus reduces the length of the sarcomere and contracts the muscle fibre.
So, the correct answer is option C.

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According to the sliding filament mechanism of skeletal-muscle contraction, during contraction:

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