In the lung cell, the door opens and closes to let small molecules and water in and out, in order to keep the cells healthy.” There are hairlike cilia on top of the lung cells that actively wave, ...

Cilia are small hairs which beat to push the mucus back up the trachea so it can be swallowed and destroyed in the stomach. Clean air then enters the two bronchi, one bronchus going to each lung.

Tiny hairs in the airways, called cilia, prevent dirt and mucus from getting into the lungs. Smoking tobacco can destroy these hairs, allowing a number of these irritants to build up in the lungs.

It can also cause lung and tissue damage and reduced air spaces and blood vessels. This type of damage reduces oxygen to vital body areas. Cilia are broom-like hairs that line the nasal passages ...