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
Facebook real-name policy controversy the acronym is employed, Facebook automatically changes to lower-case all letters except the first. (Use of periods, e.g. D.L.G., will result in a message telling users that "Profile names can't have too many periods.") Therefore, someone commonly known in real life by a name such as Mary De Leon Guerrero Mafnas would have to resort to using what on Facebook would end up being "Mary Dlg Mafnas". The message is not accompanied by an option to challenge/appeal the restriction or to send Facebook documentation that the format is how one normally formats their name in real life. In January 2015,