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DIFFERENCES BETWEEN "A" AND "I" BANDS
A-Band (Anisotropic band)
I-Band (Isotropic band)
1.
It has wide H-zone.
It has thin Z-line.
2.
It gives dark appearance and hence also
It gives light appearance hence also called
3.
called dark band.
It contains myosin filaments and parts of
light band.
It contains part of actin filaments.
actin filaments.
4.
Its length remains unchanged during
It shortens during muscle contraction.
muscle contraction.
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