What is the primary function of the respiratory system?

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. This process occurs mainly in the lungs, where oxygen from the inhaled air is absorbed into the blood, and carbon dioxide, a waste product of metabolism, is expelled from the blood into the exhaled air. This gas exchange is crucial for maintaining the body's pH balance and supporting cellular respiration, which is essential for energy production in tissues.

While the respiratory system does have additional roles, such as filtering air, regulating temperature, and producing sounds, these are secondary functions. The primary purpose revolves around oxygenation of the blood and removal of carbon dioxide, which is vital for sustaining life and ensuring that the body operates efficiently.