What happens to the amount of cilia lining the inner walls of the respiratory tract as it moves down from the upper conducting zone to the lower respiratory zone?

Question

Quizplus · Accepted Answer

The amount of cilia decreases as it moves down from the upper conducting zone to the lower respiratory zone. This is because the primary function of cilia in the upper respiratory tract is to trap and move particles out of the airways, and as air moves deeper into the lungs, the need for this function diminishes.

What Happens to the Amount of Cilia Lining the Inner