In a relaxed fibril , H - zone - a lighter region of low density, can be seen in the centre of

Anisotropic or A-band

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Isotropic or I-band

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Z-band

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Both in A and /-band

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Solution

The correct option is A Anisotropic or A-band
H zone is the region of low density that lies in the middle of the Anisotropic or the A band.
Isotropic or I band is the lighter region containing thin filaments and the Z band is the region that lies in the middle of I band.
Hence the correct option is A.

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