Question

how the lungs are kept free of germs and dirt from the air.
The alveoli act as filters for the lungs collecting particles of dirt and germs to be exhaled when the diaphragm relaxes
Tiny hairs known as cilia clean the trachea of dirt and germs before it can enter the lungs
Hairs known as cilia, found inside the alveoli, collect the dirt and germs to be expelled from the lungs
Mucus found in the bronchial tubes collects dirt and germs that gets into your lungs. Tiny hairs called cilia work to sweep out the debris collected to keep your lungs