what is the main function of the upper airway
The cells of the human body require a constant stream of oxygen to stay alive. The respiratory system provides oxygen to the bodyâs cells while removing carbon dioxide, a waste product that can be lethal if allowed to accumulate. There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the bodyâs exterior. The lungs...