Functions: Larynx(patent airway, routes air and food into correct channels, and voice production), Trachea (windpipe leading air into the lungs), Lungs(houses bronchi and alveoli where gas exchange and transport happens), Bronchi(conducting zone that transport gas to or away from respiratory zone), Alveoli(respiratory zone where gas exchange happens), and Diaphragm(contracts and flattens so air can be pulled into lungs)