Question

The word 'anisotropic band' of a skeletal muscle fibre refers to its ............... band.

• A. Light
• B. Z line
• C. Dark
• D. Both A and B

Answer 1

The correct option is C Dark

The word 'anisotropic band' of a skeletal muscle fibre refers to its dark band.

A-Band in skeletal muscle fibres is so named because it is anisotropic in its refractive index which is a characteristic of orderly crystalline structure.

H-band is the zone of the thick filaments that is not superimposed by the thin filaments. Inside the H-zone is a thin M-line formed of cross-connecting elements of the cytoskeleton.