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NEET2013ZoologyLocomotion and MovementActual

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

Options

  1. Athe absence of myofibrils in the central portion of A-band
  2. Bthe central gap between myosin filaments in the A-band
  3. Cthe central gap between actin filaments extending through myosin filaments in the A-band
  4. Dextension of myosin filaments in the central portion of the A-band

Correct answer

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

Step-by-step solution

H -zone in skeletal muscle is the central gap between actin filaments extending through myosin filaments in the A-band. Alternate arrangement of dark and light bands gives the striated appearance to a skeletal muscle. At the centre of A-band, a comparatively less dark zone called H -zone is present. In the centre of H -zone, M-line is present, formed by the threats that connect the myofilaments.

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