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Mammalian Systems and Protective Mechanisms
Electron microscope image of cilia
The bronchi and bronchioles contain cilia that help move mucus and other particles out of 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_10.jpg
OpenStax CNX
CC BY 3.0.