Pulmonary function refers to how well the lungs work to take in air and deliver oxygen to the body. It involves various processes, including breathing in (inhalation) and breathing out (exhalation). Doctors often measure pulmonary function using tests like spirometry, which assesses how much air a person can inhale and exhale, helping to identify any lung issues. Good pulmonary function is essential for overall health, as it ensures that the body receives enough oxygen to function properly. Conditions such as asthma, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis can impair lung function, making it crucial to monitor and maintain healthy lungs.