Ciliary movement refers to the rhythmic beating of tiny hair-like structures called cilia found on the surface of certain cells. These cilia can be found in various organisms, including humans, where they play a crucial role in moving substances across cell surfaces. For example, in the respiratory tract, cilia help to sweep away mucus and trapped particles, keeping the airways clear. In addition to their role in the respiratory system, cilia are also important in other biological processes. In single-celled organisms like paramecium, cilia help with locomotion, allowing the organism to swim through water. This coordinated movement of cilia is essential for various functions, including feeding and reproduction in many species.