Saunders Respiratory Practice 2025 – 400 Free Practice Questions to Pass the Exam

Pulmonary fibrosis primarily affects lung function through the process of tissue scarring, which results in a significant reduction in lung capacity. In this condition, the lung tissue becomes thickened and stiff due to excess fibrous connective tissue formation. As the lung tissue becomes scarred, it loses its elasticity, making it difficult for the lungs to expand fully during inhalation. This leads to a decrease in overall lung capacity, which translates to reduced oxygen intake and impaired gas exchange, ultimately contributing to symptoms like shortness of breath and a diminished ability to engage in physical activity.

When evaluating other aspects, swelling in the airways would typically be associated with conditions such as asthma or bronchitis, and not pulmonary fibrosis. Additionally, pulmonary fibrosis does not lead to significant increases in lung volume; rather, it causes restrictions that prevent the lungs from inflating properly. Similarly, it does not improve gas exchange; instead, it hampers the effective transfer of oxygen and carbon dioxide due to the compromised lung tissue. Thus, the effects of pulmonary fibrosis on lung function are characterized by the reduction in capacity due to the scarring of lung tissue.