What process helps keep the lungs clear of foreign particles?

The cough reflex plays a crucial role in maintaining respiratory health by clearing the lungs of foreign particles, mucus, and irritants. When a foreign substance enters the airway, sensory receptors in the respiratory tract trigger the cough response. This mechanical action forcefully expels air from the lungs at high speed, effectively dislodging and removing unwanted materials. This reflex serves as a protective mechanism, preventing potential infections and obstructions that could impair respiratory function.

In contrast, gas exchange refers to the process where oxygen is absorbed into the blood and carbon dioxide is expelled, which is essential for respiration but does not directly involve clearing foreign particles. Deep breathing can enhance lung expansion and promote air exchange but does not specifically target the removal of debris. Oxygenation is the process of providing oxygen to the body’s tissues and, while vital for overall health, it does not encompass the action of clearing the lungs of foreign objects.