Final answer:
The cytoskeleton includes microtubules, microfilaments, and intermediate filaments, but not the smooth endoplasmic reticulum, which is involved in different cellular functions.
Step-by-step explanation:
Components of the cytoskeleton may include microtubules, microfilaments, and intermediate filaments, but not the smooth endoplasmic reticulum. Microtubules are small hollow tubes that help cells resist compression, serve as tracks for motor proteins, and play a critical role in cell division by pulling chromosomes to opposite ends. Microfilaments, often associated with myosin, are involved in cellular movement, such as during cell division, and muscle cell contraction. Intermediate filaments, such as keratin, help in maintaining cell shape and anchoring organelles. The smooth endoplasmic reticulum, although an important cellular structure, is not a component of the cytoskeleton; it is involved in lipid and steroid hormone synthesis, detoxification of medications and poisons, and storage of calcium ions.