Final answer:
Obstructive lung disease improves FEV1 >12% with a bronchodilator, while restrictive lung diseases do not. diseases, such as pulmonary fibrosis, do not show a significant improvement in FEV1 with a bronchodilator because the underlying issue is stiffness or scarring of the lung tissue, which cannot be easily reversed by bronchodilation.
Step-by-step explanation:
The pulmonary condition that improves FEV1 >12% with a bronchodilator is obstructive lung disease. This includes conditions such as asthma and chronic obstructive pulmonary disease (COPD). In these conditions, the airways are narrowed or obstructed, leading to decreased airflow.
When a bronchodilator is administered, it relaxes the smooth muscles in the airways, allowing for improved airflow and an increase in FEV1. On the other hand, restrictive lung diseases, such as pulmonary fibrosis, do not show a significant improvement in FEV1 with a bronchodilator because the underlying issue is stiffness or scarring of the lung tissue, which cannot be easily reversed by bronchodilation.