What are the parts of the respiratory system and give the function of each?

The major parts of the respiratory system include the lungs, trachea, bronchi, bronchioles, and alveoli. The lungs are the primary organ where gas exchange occurs, the trachea and bronchi function to transport air to and from the lungs, and the bronchioles help regulate airflow. The alveoli are responsible for oxygen and carbon dioxide exchange in the bloodstream.