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During muscular contraction, which of th...

During muscular contraction, which of the following events occur?
(i) H-zone disappears
(ii) A-band widens
(iii) I-band reduces in width
(iv) Width of A-is unaffected
(v) M-line and Z-lne come closer
(v) M-line and Z-line come closer

A

(i), (iii), (iv) and (v)

B

(i), (ii) and (v)

C

(ii), (iv) and (v)

D

(i), (ii) and (iii)

Text Solution

Verified by Experts

The correct Answer is:
A
* As the thin filament slide inward the Z-line comes closer together.
* The length of individual thick and thin filament (i.e. the width of A  band) do not change.
* Shortening of all the sarcomere causes shortening of whole muscle fibre.
* I – band get reduced while A band retain their length.
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