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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