Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 10 - Engage - Page 216: 3


Ciliated cells of the respiratory tract are damaged by smoking. In the non-smoker, cilia of these cells and mucus normally trap particles and bacteria and move them towards the pharynx where they can be expelled by expectoration.

Work Step by Step

Because this mechanism is impaired in smokers, coughing serves the purpose of forcibly bringing up bacteria and dust particles from the trachea and preventing them from doing damage by reaching the lungs.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.