Question

Myofibrils show dark and light bands in

• A. Cardiac muscles
• B. Unstriped muscles
• C. Striped muscles
• D. Both A and C

Answer 1

The correct option is D Both A and C

• The striated appearance of skeletal and cardiac muscle tissue is a result of repeating bands of the proteins actin and myosin that are present along the length of the myofibril.
• 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.
• So, the correct answer is 'Both A and C'.