Classification Edit. The respiratory epithelium lining the upper respiratory airways is classified as ciliated pseudostratified columnar epithelium. This designation is due to the arrangement of the multiple cell types composing the respiratory epithelium.espiratory epithelium. Respiratory epithelium is a type of epithelium found lining the respiratory tract, where it serves to moisten and protect the airways. It also functions as a barrier to potential pathogens and foreign particles, preventing infection and tissue injury by action of the mucociliary escalator.
Twitter is also used by many celebrities and others in the entertainment industry (news magazines, journalists, entertainment news shows, etc...) as a way to personally connect with fans, promote projects, and break news.
Simply put, a hashtag is an easy way for people to categorize, find and join conversations on a particular topic. The hashtag is used to highlight keywords or topics within a Tweet, and can be placed anywhere within a post. Thanks to the member-driven online information site Twitter, the lowly pound or number symbol # has been elevated to a new role.