Many fibers act as paths for the movement inside the cell. It also helps in the streaming of the cytoplasm and the movement of organelles and particles. They help control the arrangement of the components of the cell wall. They also serve as tracks with tiny motors that carry vesicles from one part of the cell to another. Microtubules build the flagella and cilia that many eukaryotic cells possess.
Intermediate filaments resist tension and stabilize cell structure.
They are composed of proteins similar to those that make up hair and skin. Intermediate filaments maintain the positions of all the organelles of the cell, including the nucleus.