In a contracted skeletal muscle fibre,

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(C) During the contraction of a skeletal muscle fibre,the sliding filament theory explains the process:
$1$. The $A-$band length remains constant bec

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M-line લંબાય છે

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(C) During the contraction of a skeletal muscle fibre,the sliding filament theory explains the process:
$1$. The $A-$band length remains constant because the length of myosin filaments does not change.
$2$. The $I-$band shortens as the actin filaments slide over the myosin filaments.
$3$. The $H-$zone shortens or may disappear completely during maximal contraction.
$4$. The $M-$line remains visible as the central attachment point for myosin filaments.
Therefore,none of the options $A, B, C, D$ are strictly correct as written,but based on standard textbook questions of this type,the $H-$zone shortens and the $I-$band shortens. If the question implies what happens to the $H-$zone,it shortens. Given the options provided,there is a common error in such questions; however,the $A-$band is the only structure that remains constant in length.

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