When skeletal muscle shortens, the I band shortens while the A band does not change in length. The explanation for this is: (Lecture: skeletal muscle, Chapters: structure, the cross-bridge cycle)

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Answer

Tropomyosin pulls the myosin filament towards the Z-line.

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The actin and myosin filaments are both moving.

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The actin filament moves along the fixed myosin filament.

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The titin molecule pulls the actin filaments towards the Z-line.

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The thick myosin filament moves over the thin actin filament.

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When skeletal muscle shortens, the I band shortens while the A band does not cha...

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