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

WBJEEWBJEE 2013

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.