A) \[H-\]band is lengthened
B) H-band is obliterated
C) \[A-\]band decreases in length
D) \[Z-\]line moves away from \[A-\]band
Correct Answer: B
Solution :
During isotonic contraction the length of the sarcomere is reduced by the sliding of actin fibres towards the centre of myosin filament, hence \['H'\] zone disappears.
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