Pseudostratified columnar epithelium is a type of epithelial tissue where cells appear to be stratified due to varying cell heights, but all cells are in contact with the basement membrane. This tissue is commonly found lining the respiratory tract, where it plays a critical role in secretion and movement of mucus via cilia.
The conducting zone of the respiratory system comprises the airways that transport air to the lungs but are not involved in gas exchange. It includes structures such as the trachea and bronchi, which condition the air by filtering, warming, and humidifying it before it reaches the respiratory zone.
Bronchovesicular breath sounds are normal lung sounds heard over the major bronchi and are characterized by a medium pitch and intensity. These sounds are typically heard in the mid-chest area or between the scapulae and indicate healthy lung function when symmetrical and equal on both sides.