A) Length of A-band decrease
B) Length of 1-band remain constant
C) Length of two Z-line increases
D) Length of H-zone decreases
Correct Answer: D
Solution :
When a muscle fibre is contracted its A-band remain intact and 1-band shortens. H-zone also disappear as the actin filaments of both sides in each sarcomere may overlap each other at M-line.
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