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Table 1 Differences between the alveoli and the airways

From: Leukocyte trafficking in alveoli and airway passages

Bronchial compared with pulmonary circulation
   Structure of vessels
   Expression of adhesion molecules
   Size and hemodynamic characteristics of the site of leukocyte
Structural differences in alveolar walls compared with bronchial walls
   Cell types present
   Anatomy and properties of the extracellular matrix
Response of structural cells at each site to inflammatory stimuli
   Mediators released (cytokines, chemokines, and others)
   Adhesion molecules expressed and used
   Contribution of biomechanical events
Stimuli and disease processes affecting alveoli compared with airways