Answer:
The correct answer will be myosin.
Explanation:
Myofibril in the muscle consists of thick filaments and thin filaments. The protein present in the thick filament is known as "myosin", a protein which converts the chemical energy of ATP into mechanical energy. It moves on the thin actin filaments and is known as motor protein and helps in the generation of force and movement.
This myosin protein is composed of the heavy chain and many light chains which is divided into globular head, neck and tail region.
Thus, myosin is the correct answer.
