NEET 2001 Biology question

Which statement is correct for muscle contraction : -

(1)Length of H-zone become decreaseCorrect
(2)Length of A-band remains constantCorrect
(3)Length of I-band become increase
(4)Length of two Z-line become increase

Answer: (1),(2)

Solution

According to the sliding-filament theory, during contraction the thin (actin) filaments slide over the thick (myosin) filaments towards the centre of the sarcomere. The thick filaments keep their length, so the A-band (the length of the myosin filaments) remains constant, statement (2) is true. The H-zone (the

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Question ID VK-088880