Chapter 22, Problem 12RQ

Summary Introduction

To review:

The functional reason behind the opposite orientation of cilia below and above the larynx.

Introduction:

The upper and lower respiratory passages have cilia that help in clearing the passages of dust, pollen, and other particles after they are trapped in a viscous layer of mucus. The location of the structure in the respiratory passage determines whether the cilia will move in an upward or downward direction.