Question: please Describe the structure of sarcomere.

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.