Cilia are involved in the movement of mucus across an epithelial layer.
Cilia are small, slender, hair-like structures present on the surface of all mammalian cells. They are primitive in nature and could be single or many. Cilia play a major role in locomotion. They are also involved in mechanoreception. The organisms that possess cilia are known as ciliates. They use their cilia for feeding and movement. There are two types of Cilia - Motile & Non-Motile Cilia.
The important functions performed by cilia involve locomotion and sensory functions. They play a major role in cell cycle and replication and also in the development of humans and animals. Multiple cilia move in a rhythmic motion that keeps the internal passageways free from mucus or any foreign agent. A few non-motile cilia act as an antenna that receives sensory information for the cells and processes these signals from the surrounding fluids. For E.g. the cilia present in the kidney bend forcefully as the urine passes. This sends signals to the cells that the urine is flowing. The non-motile cilia found in the photoreceptors of the retina help in the transport of molecules from one end to the other.
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