What primary function do the lungs serve in the body?

The primary function of the lungs is to facilitate gas exchange between the body and the environment. This is achieved through the process of respiration, where oxygen from inhaled air is absorbed into the bloodstream, and carbon dioxide, a waste product of metabolism, is expelled from the body during exhalation.

Lungs contain millions of tiny air sacs called alveoli, where this exchange occurs. The large surface area of the alveoli enables a significant amount of oxygen and carbon dioxide to be exchanged efficiently. This process is crucial for maintaining proper oxygen levels in the blood, supporting cellular functions across various systems in the body. Thus, the role of the lungs in gas exchange is vital for sustaining life and ensuring that tissues receive adequate oxygen for metabolism while efficiently removing carbon dioxide.