Uttarakhand PMT Uttarakhand PMT Solved Paper-2007

  • question_answer Which statement is correct for muscle- contraction ?

    A) Length of H zone decreases

    B)  Length of A band decreases

    C)  Length of I band remain constant

    D) Length of two Z line increases

    Correct Answer: A

    Solution :

    When a muscle fibre is contracted its A band remains intact and I band shortens. H zones also disappear as the actin filaments of both sides in each macromere may overlap each other at M line.

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