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NEET Biology NEET PYQ-Locomotion and Movement

  • question_answer
    Which statement is correct for muscle contraction? [AIPMT 2001]

    A) Length of H-zone is decreased      

    B) Length of A-band remains constant

    C) Length of l-band gets increased

    D) Length of two Z-line get increased

    Correct Answer: A

    Solution :

    [A] When Ca+ ions combine with troponin contraction of muscle initiates. During contraction, die Z lines come closer together and the sarcomere becomes shorter. The length of A band remains constant. I bands shortens and H zone narrows.


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