Locomotion and Movement Question 8

8. Which statement is correct for muscle contraction?

(a) Length of $H$-line decreases

(b) Length of A-band remains constant

(c) Length of I-band increases

(d) Length of two Z-lines increase

Show Answer

Answer : a,b

Hints & Solutions

(a,b) When $Ca^{+}$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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