During muscular contraction which of the following events occur ?
(a) ‘H’ zone disappears
(b) ‘A’ band widens
(c) ‘I’ band reduces in width
(d) Myosin 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.

see full answer

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(b), (d), (e), (a) only

(b), (c), (d), (e) only

(a), (c), (d), (e) only

(a), (b), (c), (d) only

answer is B.

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Detailed Solution

During muscle contraction, the cross bridges pull the thin filaments towards the centre 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.

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