NEET 2013 Biology question

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

(1)the absence of myofibrils in the central portion of A-band
(2)the central gap between myosin filaments in the A-band
(3)the central gap between actin filaments extending through myosin filaments in the A-bandCorrect
(4)extension of myosin filaments in the central portion of the A-band.

Answer: (3)

Solution

The A-band (dark band) is made of myosin (thick) filaments overlapped at its two ends by actin (thin) filaments, which extend inwards from the Z-lines. In the central part of the A-band the actin filaments from the two sides do not reach each other; this central region containing

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Question ID VK-091434