trachea
the trachea, which splits at the so-called bifurcation, i connected below the larynx. in adults, the trachea is approx. 10-12 cm long and is held open by 16 to 20 C-shaped cartilage rinds during the negative pressure created by inhalation. The trachea is lined with respiratory epithelia, which enable the heating and humidification of inhaled air as well as the removal of mucus and dirt via the movement of the cilia toward the larynx