Figure 6 - Effects of intrathoracic and extrathoracic obstruction on the caliber of airways.
From the following article
Anatomy, development, and physiology of the lungs
Richard M. Effros
GI Motility online (2006)
doi:10.1038/gimo73
Intrathoracic obstruction is most severe during expiration and is relieved during inspiration. Extrathoracic obstruction is increased during inspiration because of the effect of atmospheric pressure to compress the trachea below the site of obstruction.
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