ZoologyWhich of the following occurs during muscle relaxation? 

Which of the following occurs during muscle relaxation? 

  1. A

    Active transport of  Ca++ into sarcoplasmic cisternae 

  2. B

    Increase in the length of A-bands

  3. C

    Binding of Ca++ to troponin 

  4. D

    Sliding of thin filaments towards M-line

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    Solution:

    During muscle relaxation, the  Ca++ ions are pumped back to the sarcoplasmic cisternae resulting in the masking of actin filaments. This causes the return of ‘Z’ lines back to their original position, i.e., relaxation. A bands retain their length during contraction. During muscle relaxation, thin filaments move away from M line.

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