09/09/2026
The lining of your airways helps move unwanted material back out 🫁
A thin layer of mucus can trap particles that enter with the air you breathe. Beneath that layer, tiny moving projections called cilia work together to help transport the mucus along the airway. Clearing mucus is one of the ways the respiratory system protects itself.
This enlarged view separates the parts that are difficult to see at their real size: the cells forming the lining, the fine cilia on their surface, and the mucus above them. The small gray particles represent material caught in that layer.
Look at how the cilia sit beneath the mucus rather than floating freely inside the airway. Their position allows movement at the cell surface to help carry trapped material away. The image is a simplified model of this coordinated cleaning process.