Question

Anisotropic band is formed due to contribution of

• A. Myosin filaments
• B. Actin filaments
• C. Elastin filaments
• D. Both (1) and (2)

Answer 1

Answer: (D)

Both (1) and (2)

Answer 2

The anisotropic band, also known as the A-band (dark band), in a sarcomere is composed of the entire length of the thick myosin filaments. In the regions where the thick myosin filaments overlap with the thin actin filaments, both types of filaments are present. Therefore, the A-band contains both myosin and actin filaments. The anisotropic nature (doubly refractive property) of this band is due to the highly ordered arrangement and presence of both types of filaments.