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

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

Solution & Step-by-step Explanation

In a sarcomere, the H-zone is the central part of the thick filament (myosin) that is not overlapped by the thin filaments (actin).

Practice this question

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The H-zone in the skeletal muscle fibre is due to:
A
The absence of myofibrils in the central portion of A-band.
B
The central gap between myosin filaments in the A-band.
C
The central gap between actin filaments extending through myosin filaments in the A-band.
D
Extension of myosin filaments in the central portion of the A-band.

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