What is the term for the motile, hair-like outgrowth from certain eukaryotic cells that aids in movement?

The correct term for the motile, hair-like outgrowth from certain eukaryotic cells that aids in movement is cilium. Cilia are microscopic, hair-like structures that extend from the surface of many types of eukaryotic cells. They are primarily involved in locomotion, as they can beat in coordinated waves to propel the cell or move fluid over the cell surface.

Cilia are particularly prominent in certain protists, as well as in the respiratory tract of animals, where they help move mucus and trapped particles out of the lungs. Their structure allows for effective movement, which is crucial for the cells’ functions in both unicellular and multicellular organisms.

While flagella are also hair-like structures that contribute to movement, they are typically longer than cilia and are found in fewer numbers per cell. They exhibit a different type of motion and are often associated with sperm cells and some algae.

Pili are hair-like structures found on the surface of some bacteria that enable attachment to surfaces or other cells, but they do not play a role in motility in the same way cilia or flagella do. Microvilli, on the other hand, are not involved in movement but serve to increase the surface area of a cell for