Trachea the trachea. The trachea is no more than 4mm diameter during the first year of life, expanding to its adult diameter by late childhood. The trachea is more mobile and of more variable length, deeper, and smaller in children. The trachea is lined with a layer of pseudostratified ciliated columnar epithelium. The epithelium contains goblet cells, which are glandular, modified simple columnar epithelial cells that produce mucins, the main component of mucus. Mucus helps to moisten and protect the airways. Mucus lines the ciliated cells of the trachea to trap inhaled foreign particles that the cilia then waft upward toward
The Human Body (TV series) July 2001 and includes a 50-minute feature on "The Making of the Human Body" - A final overview that reveals the techniques and developments that made the series possible. The series was adapted into a film released for IMAX cinemas. The film won the Giant Screen Theatre Association's Best Film For Lifelong Learning award. The book accompanying the series was written by Anthony Smith. According to one review, "Smith transcends anatomical trivia to record our bodies' powerful tale with empathy and clarity." The Human Body (TV series) The Human Body is a seven-part documentary series, first shown on 20 May