upper lung
upper lung
A functional division of the lungs which is based on differences in:(1) Physiology:
Upper lungs have greater mechanical stress, lower lymphatic flow, higher oxygen tension and pH; and
(2) Pathology:
Upper lungs are more often involved by chronic granulomatous disease (e.g., tuberculosis, sarcoidosis, silicosis), hypersensitivity pneumonitis, and smoking-related disease (e.g., emphysema, respiratory bronchiolitis, pulmonary Langerhans cell histiocytosis).