Figure 3 - Schematic diagram of lung anatomy with cross-sections of bronchi, bronchioles alveolar ducts, and alveoli.
From the following article
Anatomy, development, and physiology of the lungs
Richard M. Effros
GI Motility online (2006)
doi:10.1038/gimo73
a: Gross anatomy of lung and thorax. b: Microscopic anatomy of bronchial wall. C: View of terminal airway and alveoli. d: Alveolar structure.
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