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
Correct Answer: C
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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