cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and goblet cells to clean the air before it reaches the lungs Goblet cells produce mucus which traps dust ...

indicating a potential intriguing use of adult human epithelial cells recovered from the trachea. Human bronchial epithelial cells self-construct into multicellular motile living architectures.

Avian and human flu viruses seem to target different regions of a patient's respiratory tract. Although more than 100 people have been infected by H5N1 influenza A viruses, human-to-human ...