What happens to lung function during a respiratory infection?

• A. It remains unchanged
• B. It improves due to increased mucus production
• C. It may impair gas exchange and increase coughing
• D. It increases oxygen saturation levels

Answer: (C)

During a respiratory infection, lung function can be significantly impacted, particularly in ways that compromise breathing and gas exchange. The infection can cause inflammation in the airways, leading to bronchoconstriction and increased mucus production. This mucus can obstruct airflow, making it more difficult for air to move in and out of the lungs.

As a result, gas exchange, which is critical for delivering oxygen to the bloodstream and expelling carbon dioxide, may become impaired. Additionally, the irritation caused by the infection often results in increased coughing as the body attempts to clear the mucus and pathogens from the airways. This combination of impaired gas exchange and heightened coughing is characteristic of respiratory infections and highlights the overall decrease in lung function during such illnesses.