Upper respiratory tract Computer artwork of a profile view of a female head showing the upper respiratory tract Air enters the nostrils and is filtered and warmed as it travels through the nasal cavity upper centre The nasal cavity meets the oral cavity centre at the throat to form the pharynx The air then travels into the trachea wind pipe right over the larynx voice box dark slit and then down into the lungs not seen Behind the trachea is the oesophagus food pipe
