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 dark band is known as ‘A’ or Anisotropic band which carries Myosin whereas the light bands which carry actin and are called I-band or Isotropic band. Hence called striped muscles thanks to the presence of striations.-Hence Myofibrils show dark and lightweight bands in Cardiac muscles and striated muscles.

Detailed explanation-4: -Myofibrils are composed of overlapping thick and thin myofilaments organized into distinct, repeating units called sarcomeres.

Detailed explanation-5: -Smooth Muscle Skeletal Muscle and Cardiac Muscle are also called ‘striated muscle’, because they have dark and light bands running across the muscle width when they are looked at under the microscope.