During muscular contraction which of the following events occur ? (a) ‘H’ zone disappears (b) ‘A’ band widens (c) ‘I’ band reduces in width (d) Myosine hydrolyzes ATP, releasing the ADP and Pi (e) Z-lines attached to actins are pulled inwards Choose the correct answer from the options given below. (1) (a), (c), (d), (e) only (2) (a), (b), (c), (d) only (3) (b), (c), (d), (e) only (4) (b), (d), (e), (a) only
Option 1) During muscle contraction, the cross bridges pull the thin filaments towards the center of A band. The Z line attached to the actins are also pulled inwards thereby causing a shortening of the sarcomere. The I bands get reduced, whereas the 'A' bands retain the length. Myosin head acts as ATPase.
