What is the primary function of the respiratory system?

The primary function of the respiratory system is to facilitate gas exchange. This process involves taking in oxygen from the environment and expelling carbon dioxide produced by the body's metabolism. Oxygen is essential for cellular respiration, which is the process by which cells generate energy. The respiratory system, through structures such as the lungs and alveoli, enables this exchange to occur efficiently. As oxygen enters the bloodstream, it is transported to cells throughout the body, while carbon dioxide, a waste product, is removed and exhaled. This critical role of maintaining proper levels of oxygen and carbon dioxide in the blood is vital for sustaining life and supporting various bodily functions.