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(C) According to the sliding filament theory,when a skeletal muscle contracts,the actin filaments slide over the myosin filaments.$1$. The $I$-band (L

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Unchanged | Shortens | Disappears

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(C) According to the sliding filament theory,when a skeletal muscle contracts,the actin filaments slide over the myosin filaments.$1$. The $I$-band (Light band) shortens as the actin filaments are pulled towards the center of the sarcomere.$2$. The $A$-band (Dark band) remains unchanged in length because the length of the myosin filaments does not change.$3$. The $H$-zone shortens and eventually disappears as the actin filaments overlap completely in the center of the sarcomere.Therefore,the correct sequence is: $I$-band shortens,$A$-band remains unchanged,and $H$-zone disappears.

Which one of the following takes place in a myofibril when skeletal muscle contracts?
$A$-band (Dark band) | $I$-band (Light band) | $H$-zone

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Which one of the following takes place in a myofibril when skeletal muscle contracts?$A$-band (Dark band) | $I$-band (Light band) | $H$-zone