Question

Cells lining the respiratory tract contain ______ that help keep the lungs clear of particles.

Answer 1

The Chevy answer is:
Cilia
I hope this helps you

Answer 2

Cells lining the respiratory tract contain CILIA that help keep the lungs clear of particles, dirt and mucus. Cilia are microscopic, hair like protrusions from the cells that help sweep any foreign particles away from the airway and lungs.

Hope this helps! :)