3. Pathology 1) main primary disorders of lung chronic bronchitis and emphysema 2). changes of pulmonary vessels A. the wall of pulmonary vessels thickening, narrowing, or obliterative B. capillary bed of alveolar wall damaged, decreased C. vascular bed of lung compressed to be irregular3.Pathology 1). main primary disorders of lung chronic bronchitis and emphysema 2). changes of pulmonary vessels A. the wall of pulmonary vessels thickening, narrowing, or obliterative B. capillary bed of alveolar wall damaged , decreased C. vascular bed of lung compressed to be irregular