Concept
Version 8
Created by Boundless
Mammalian Systems and Protective Mechanisms
Route of inhalation
Air enters the respiratory system through the nasal cavity and pharynx. It then passes through the trachea and into the bronchi, which bring air into the lungs.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Systems of Gas Exchange. October 17, 2013."
http://cnx.org/content/m44792/latest/Figure_39_01_06.png
OpenStax CNX
CC BY 3.0.