Multiple choice

The muscle band that remains unchanged during contraction and relaxation of the skeletal muscle is

  1. I

  2. H

  3. A

  4. A-line
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During contraction and relaxation of muscles, both I-band and H-zone progressively shorten and disappears.Dark A-band (anisotropic) undergo no change during contraction and relaxation of muscle fibres.

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