For one thing, the inside of the trachea is lined with tiny hairlike filaments called cilia that beat synchronously ... and so if you look at the literature, you'll see hundreds and hundreds ...

More information: Yusheng Wang et al, Sensory artificial cilia for in situ monitoring of airway physiological properties, Proceedings of the National Academy of Sciences (2024). DOI: 10.1073/pnas ...

Cilia depend on their highly differentiated structure, a 9 + 2 arrangement, to remove particles from the lung and to transport reproductive cells. Immortalized cells could potentially be of great ...