Final answer:
Vimentin, desmin, and keratin are examples of intermediate filaments, which are part of the cytoskeleton providing structural support and tensile strength to cells and tissues.
Step-by-step explanation:
Vimentin, desmin, and keratin are types of intermediate filaments, which are cytoskeletal components in cells. These filaments measure approximately 10 nm in diameter, sitting between the thinner actin filaments (microfilaments) and the thicker microtubules in size. Intermediate filaments provide structural support for cells, helping to maintain their shape, and play a prominent role in resisting tensile stress.
The protein desmin is found in desmosomes, which connect muscle cells to one another, thereby conferring resistance to external physical forces on muscle tissue. Likewise, keratin is a structural protein that is prevalent in hair, nails, and the epidermis, contributing to the rigidity and integrity of these structures. Overall, intermediate filaments are essential for maintaining the integrity of cells and tissues in response to mechanical stress.