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03-18-2009, 10:01 AM
Lung Defense
1. Particles removed from inspired air by the nose.
2. The larynx acts as sphincter during cough.
3. Protective agents in the lung lining fluids.
i. Surfactant bacterial opsonisation.
ii. Immunoglobulin IgA, IgM, IgG.
iii. Complement.
iv. bactericidal proteins and proteinase inhibitors that protect host tissue during the inflammatory response.
4. Alveolar macrophaes.

Source: Internal Medicine Book of Dr.Osama Mahmoud (Ain Shams University)