MICROANATOMY

Detailed explanation-1: -The darker bands are called anisotropic bands (A bands). Together the I-bands and A-bands contribute to the striated appearance of skeletal muscle.

Detailed explanation-2: -The dark bands are called A-bands or anisotropic bands and light bands are called I-bands or isotropic bands. The dark band has a light zone in between called H-zone or Henson’s zone.

Detailed explanation-3: -The A-band appears black, comprising thick filaments that are partially overlapped with thin filaments. The thick and thin filaments overlap contain myosin to form dark bands called A bands.

Detailed explanation-4: -The A band in skeletal muscle is also called as anisotropic band. The anisotropic band is made of both actin filaments and myosin filaments.

Detailed explanation-5: -The light bands are called I bands and contain only thin filaments. The dark bands are called A bands and contain thick and thin filaments, with the thick filaments running the entire length of the A band. Thus the length of the thick filament determines the length of the A band.