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.
