What is the nature of muscle fibers in the sarcoplasm?

.Skeletal muscles are known as voluntary muscles because their activities are under the voluntary control of the nervous system.Muscle fiber is a syncitium as the sarcoplasm contains many nuclei.The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.

The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.The light bands in a myofibril contain actin and is called I-band or Isotropic band.