What are the parallelly arranged filaments in the sarcoplasm called?

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.Skeletal muscles are known as voluntary muscles because their activities are under the voluntary control of the nervous system. Each organised skeletal muscle in the body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fasciA.Each muscle fiber is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm. A characteristic feature of the muscle fiber is the presence of a large number of parallelly arranged filaments in the sarcopla