A) Length of H-zone decreases
B) Length of A-band remains constant
C) Length of I-band increases
D) Length of two Z-line increases
Correct Answer: A
Solution :
When\[C{{a}^{+}}\]ions combine with troponin contraction of muscles initiates. During contraction the Z lines come closer together and the sarcomere becomes shorter. The length of A band remains constant. I-bands shortens and H-band narrows.
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