What is the primary function of the respiratory system?

The primary function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide. This process occurs in the lungs where oxygen from the air enters the bloodstream, allowing it to be delivered to cells throughout the body. Conversely, carbon dioxide, a waste product of metabolism, is removed from the bloodstream and exhaled back into the atmosphere. This exchange is crucial for maintaining cellular respiration and overall homeostasis.

While other systems in the body handle functions such as nutrient and waste exchange, regulating body temperature, and maintaining fluid balance, these do not directly pertain to the primary role of the respiratory system. Through respiration, the body ensures that it receives the oxygen necessary for energy production and metabolism while efficiently expelling carbon dioxide, which is vital for sustaining life.