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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-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
Muscle contraction is brought about by sliding movement of actin filaments over myosin filaments. When a muscle fibril contracts, ita A band remain constant and I band shortens. H zone also disappears as the actin filaments of both sides in each sarcomere overlap each other at M-line. M-line and Z-line also come closer.
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