Here's a bit more about them:
* Structure: Cilia are microscopic hair-like projections that extend from the surface of certain cells. They are made up of microtubules arranged in a specific pattern.
* Movement: Cilia beat rhythmically, creating a wave-like motion that propels fluids or particles across the cell surface. This motion is powered by the movement of the microtubules within the cilia.
* Function: Cilia have a variety of functions depending on their location in the body. Some examples include:
* Moving mucus and debris: Cilia in the respiratory tract help to sweep mucus and trapped particles out of the lungs.
* Transporting fluids: Cilia in the fallopian tubes help to move eggs towards the uterus.
* Sensory perception: Cilia in the inner ear play a role in hearing and balance.
Note: Similar to cilia, but often longer, are flagella. They are also hair-like structures that aid in movement, but are typically used for locomotion of the cell itself, such as in sperm cells.