The nose, ambient air, and airway mucosa. A pathway in physiology.
D000397:Air Pollution; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D009297:Nasal Mucosa / Q000502:physiology; D009666:Nose / Q000502:physiology; D010827:Physiology / Q000266:history*; D012123:Pulmonary Ventilation; D012119:Respiration