What is the function of cilia in the respiratory tract?

Question

What is the function of cilia in the respiratory tract?

Answer 1

They help to move mucus throughout the respiratory tubes.

Answer 2

Tiny hairs called cilia protect the nasal passageways and other parts of the respiratory tract, filtering out dust and other particles that enter the nose with the breathed air. As air is inhaled, the cilia move back and forth, pushing any foreign matter (like dust) either toward the nostrils, where it is blown out, or toward the pharynx, where it travels through the digestive system and out with the rest of the body's waste.