What is the main function of the respiratory system?

The main function of the respiratory system is to facilitate gas exchange between the body and the environment. This process is crucial for obtaining oxygen, which is essential for cellular respiration and energy production in the body, while simultaneously removing carbon dioxide, a waste product of metabolism. The respiratory system accomplishes this through structures such as the lungs, where oxygen is inhaled and diffused into the bloodstream, and carbon dioxide is expelled during exhalation.

Other functions of the respiratory system include regulating blood pH through the balance of carbon dioxide levels and protecting the body from foreign pathogens through mechanisms such as mucous membranes and cilia. However, the primary role remains the exchange of gases necessary for sustaining life.