Mucociliary clearance.
D000336:Aerosols; D001980:Bronchi / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D008168:Lung / Q000187:drug effects / Q000378:metabolism*; D008688:Methacholine Compounds / Q000494:pharmacology; D009093:Mucus / Q000187:drug effects / Q000378:metabolism; D012907:Smoking; D013268:Stimulation, Chemical; D013667:Technetium
D000336:Aerosols; D008688:Methacholine Compounds; D013667:Technetium