Question

Describe the structure of sarcomere.

Answer 1

• Sarcomere are the basic unit of striated muscle tissue.
  
• It forms the repeating unit between two Z lines.
• Skeletal muscles is made up of tubular muscle cells.
• Each muscle fibers contain numerous tubular myofibrils.
• The myofibrils consists of repeating sections of sarcomeres which appear as alternating dark and light bands.
• Sarcomeres are composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.
• Two of the important proteins are:-

1) Myosin forms the thick filament.

• Myosin has a long fibrous tail and a globular head, which binds to actin.
• Its head also binds to ATP, which is the source of energy for muscle movement.

2) Actin forms the thin filament.

• These molecules are bound to the Z line that form the borders of the sarcomere.