In a contracted skeletal muscle fibre,

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

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$I$-band shortens

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(B) 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, the $I-$band shortens during muscle contraction.

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