The trachea bifurcates into two, the right and left trachea, at the level of what vertebra? a) first thoracic vertebra(T1) b) second thoracic vertebra(T2) c) third thoracic vertebra(T3) di fourth thoracic vertebratT4) Q50) True or False? The mechanism whereby small hairs that line the epithelium of the respiratory tract called cilia that beats thythmically out from the lungs, moving secreted mucus with foreign particles toward the laryngopharyrx upwards and outwards is called "mucociliary escalator mechanism a) False b) True