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Levels of organization of muscle ( in decreasing order)

1. Muscle: Group of muscle fascicles, which work together to cause one specific movement.

2. Fascicle: Bundle of muscle fibers

3. Muscle fiber: Muscle cell: cylindrical cell of skeletal muscle. It has many nuclei, therefore it is called multinucleate.

4. Myfibril: Contractile fibers found within a muscle cell. It has 100 - 1000's of muscle cells in each muscle fiber.

5. Sarcomere: Structural and Functional unit of the muscle. It is the smallest unit of a muscle that is able to contract.

6. Actin and myosin filaments: Filamentous proteins which can interact together to cause contraction.

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