Answer: Myosin Only
Explanation: A sarcomere can be defined as the basic unit of striated muscles. It forms the repeating unit between the two Z lines.
It is basically formed by the tubular muscle cells which is known as myocytes and the process of formation of myocytes is known as myogenesis.
It is composed of a thick component and a thin component. The thick component is known as Myosin and thin component is known as the actin.
The mysoin part of the muscle binds to ATP which provides energy for the contraction and relaxation of muscles.