This medical exhibit features the anatomy of the respiratory system and lungs. Labels: nasal cavity, nasopharynx, oropharynx, epiglottis, glottis, trachea, lung bronchus and bronchioles. Also depicts the anatomy and functions of the trachea, bronchi and bronchioles. The final graphic shows gas exchange within an alveolus, the thin-walled sac of the terminal bronchioles. Oxygen and carbon dioxide are seen moving to and from the pulmonary capillaries.