What is the general function of the system is to exchange gases between the external environment and the blood?

The general function of the respiratory system is to facilitate the exchange of gases, primarily oxygen and carbon dioxide, between the external environment and the bloodstream. Inhalation brings oxygen-rich air into the lungs, where it diffuses into the blood through the alveoli. Conversely, carbon dioxide, a waste product of metabolism, is expelled from the blood into the lungs and exhaled into the environment. This process is essential for maintaining cellular respiration and overall metabolic function in the body.