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