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a
Each I band is bisected at its centre by a Z line
b
An M line is present at the centre of each A band
c
The thin filaments of an I band attached to the Z line
d
The thick filaments are attached to the thin filaments by the M line
answer is D.
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Detailed Solution
The thick filaments in the A band are held together in the middle of this band by a thin fibrous membrane called M line. The M line does not attach thick filaments to thin filaments.