Question

Differentiate between A-band and I-band.

Answer 1

The most striking feature of striated muscle fibre is the presence of transverse striations on it. These striations appear as alternate dark and light bands that stretch across the muscle fibre. These dark and light bands are called A-bands and I-bands respectively. The A-band is made up of myosin filaments whereas the I-band is made up of actin filaments alone. A-Bands are the anisotropic bands of the sarcomere. I-Bands are the isotropic bands of sarcomere