The cytoskeleton - a network of protein threads that run through the cytoplasm.
In eukaryotic cells, these protein threads are arranged as microfilaments (small solid strands) and microtubules (tiny protein cylinders).
The cytoskeleton has 4 main functions :
1) Microtubules & Microfilaments support the organelles, keeping them in position
2) M&M also help to strengthen the cell and maintain its shape
3) They're responsible for the transport of materials in the cell.
4) The proteins of the cytoskeleton can also cause the cell to move around.
E.g. The movement of cilia and flagella is caused by the cytoskeletal protein filaments that run through them. Single cells that have flagellum like sperm cells, will have the cytoskeleton propelling the whole cell.
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