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Answer:
Muscle fiber → myofibrils → myofilaments → sarcomere.
The muscles are made up of long cylindrical muscle cells called muscle fibres which are organized together in bundles to form muscle bundles. The muscle fibres are formed by the fusion of the myoblasts which consists of nucleus and mitochondria to provide energy.
The muscle fibres are composed of the myofibrils which contain the myofilaments mainly the thin filaments called actin and the thick filaments called myosin.
These actin and myosin are arranged in repeated functional units called sarcomere. The sarcomere is the basic structural and functional unit of life which helps in muscle contractions. The filaments in the muscle are arranged into bands- Isotropic and anisotropic bands.
A muscle is a group of muscle tissues which are able of contraction in order to produce a force. A muscle consists of fibers of muscle cells engulfed by protective tissue.
levels of organization of muscles
- Molecular level (actin and myosin)
- Microscopic level ( sarcomere and myofibrils)
- Cell level (myoblasts and myofibers)
- Tissue level (neuromuscular junctions and fascicles)
What is Sarcomere
A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments which are actin and myosin.
These protein filaments are the active structures responsible for muscular contraction.
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