The respiratory tract is a system of organs and passages that allows for the exchange of gases, primarily oxygen and carbon dioxide, in the body. It begins at the nose and mouth, where air enters, and continues through the throat, windpipe, and into the lungs. The lungs are where the actual gas exchange occurs, as oxygen is absorbed into the bloodstream and carbon dioxide is expelled. The respiratory tract is divided into two main parts: the upper respiratory tract and the lower respiratory tract. The upper respiratory tract includes the nasal cavity, pharynx, and larynx, while the lower respiratory tract consists of the trachea, bronchi, and lungs. Proper functioning of the respiratory tract is essential for maintaining overall health and supporting cellular processes.