MICROANATOMY

Detailed explanation-1: -The striated appearance of skeletal muscle tissue is a result of repeating bands of the proteins actin and myosin that are present along the length of myofibrils . Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes the entire cell to appear striated or banded.

Detailed explanation-2: -The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin. Hence called striped muscles due to the presence of striations. Hence Myofibrils show dark and light bands in Cardiac muscles and striped muscles.

Detailed explanation-3: -the A-bands (anisotropic in polarized light) appear dark in color. The alternating pattern of these bands results in the striated appearance of skeletal. muscle. The Z-lines (Zwischenschieben) bisect the I-bands. A light band called the H-band (Heller) sits within each A-band. The M-line (Mittelschiebe.

Detailed explanation-4: -In physiology, isotropic bands (better known as I bands) are the lighter bands of skeletal muscle cells (a.k.a. muscle fibers). Isotropic bands contain only actin-containing thin filaments. The darker bands are called anisotropic bands (A bands).

Detailed explanation-5: -Skeletal muscles and cardiac muscles are called striated muscles due to the presence of alternate dark and light bands. When stained, this arrangement is visible as light and dark bands under the microscope. Hence, striations appear on striped muscles.