Figure 5 - Flow-volume loops.
From the following article
Anatomy, development, and physiology of the lungs
Richard M. Effros
GI Motility online (2006)
doi:10.1038/gimo73
a: Normal. b: Intrathoracic obstruction. c: Restriction. d: Variable extrathoracic obstruction. e: Fixed airway obstruction.
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