Pulmonary secretions are fluids produced in the lungs and airways, primarily consisting of mucus. This mucus helps trap dust, bacteria, and other particles, preventing them from entering the lungs. It plays a crucial role in maintaining respiratory health by keeping the airways moist and facilitating the removal of unwanted substances through coughing. In certain conditions, such as asthma or chronic obstructive pulmonary disease (COPD), the production of pulmonary secretions can increase, leading to difficulty in breathing and increased risk of infection. Proper management of these secretions is essential for maintaining clear airways and overall lung function.