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

Extension of actin filaments in the central portion of the A-band

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The absence of myofibrils in the central portion of A-band

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The central gap between myosin filaments in the A-band

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The central gap between actin filaments extending through myosin filaments in the A-band

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Solution

The correct option is D The central gap between actin filaments extending through myosin filaments in the A-band
The central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone. It is the central gap between actin filament extending through myosin filament in A-band as shown below.

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