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The H-zone in the skeletal muscle fibre is due to:

1. The central gap between myosin filaments in the A-band.
2. The central gap between actin filaments extending through myosin filaments in the A-band.
3. Extension of myosin filaments in the central portion of the A-band.
4. The absence of myofibrils in the central portion of A-band.

Correct answer: The central gap between actin filaments extending through myosin filaments in the A-band.

Solution

The H-zone is the central lighter region of the A-band where thin actin filaments do not overlap the thick myosin filaments. Because only myosin is present there, it appears less dense than the surrounding overlap region.

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