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Define cell movements

Cell movements: Cell movements are movements functioned by cell structures, similar to the movements of cilia and flagella, the pseudopod movements (in amoeba, macrophages, and so on), the cyclosis of cytoplasm and the sarcomere contraction in the muscle cells.

Cell movements can be formed by the citoskeleton action, by the differences of viscosity among cytoplasmic areas and by intra-cellular contraction systems.   

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