The nose--a defence against the atmospheric environment.
D000234:Adenoids / Q000502:physiology; D000336:Aerosols; D005374:Filtration; D006801:Humans; D008954:Models, Biological; D009297:Nasal Mucosa / Q000033:anatomy & histology / Q000502:physiology; D009666:Nose / Q000033:anatomy & histology / Q000502:physiology*; D010256:Paranasal Sinuses / Q000502:physiology; D010614:Pharynx / Q000033:anatomy & histology; D012123:Pulmonary Ventilation; D012119:Respiration; D013458:Sulfur Dioxide; D014420:Turbinates / Q000033:anatomy & histology
D000336:Aerosols; D013458:Sulfur Dioxide