The primary function of the lungs is to facilitate the exchange of oxygen and carbon dioxide between the body and the environment. When we inhale, air enters the lungs where oxygen diffuses into the blood through the thin walls of the alveoli, which are tiny air sacs. Simultaneously, carbon dioxide, a waste product generated by the body's metabolism, diffuses out of the blood and is expelled when we exhale. This gas exchange is crucial for maintaining proper oxygen levels in the body, supporting cellular processes, and ultimately sustaining life. The efficiency of the lungs is vital for overall respiratory health.