What is the main difference between conducting and respiratory zones? The conducting zone is composed of organs that serve as a pathway for air into the lungs, whereas the respiratory zone is composed of structures for gas exchange The conducting zone refers to blood that is deoxygenated, whereas the respiratory zone refers to blood that is oxygenated The conducting zone is made of the lungs and diaphragm, whereas the respiratory zone is made of the mouth and oral cavity The conducting zone refers to organs above the diaphragm, whereas the respiratory zone refers to organs below the diaphragm.