Conducting zone

The conducting zone of the respiratory system is made up of the nose, pharynx, larynx, trachea, bronchi, bronchioles, and terminal bronchioles; their function is to filter, warm, and moisten air and conduct it into the lungs. It consists of a series of interconnecting cavities and tubes both outside and within the lungs. It is composed of the 1st through the 16th division of the respiratory tract (airway).

The conducting zone is thus most of the respiratory tract (airway); it is the portion of the airway that conducts gases, but excludes the portion that exchanges gases (which is the respiratory zone). Thus,

Functions

Trachea	Tracheal rings Annular ligaments Carina

Bronchi	Main left right Secondary eparterial Tertiary

General	Landmarks Base Apex Root Hilum Fissures Horizontal Oblique Superior lobe Lingula of left lung Middle lobe of right lung Inferior lobe

BP segment	Bronchiole: Conducting zone (Terminal bronchiole) Respiratory zone (Respiratory bronchiole Alveolar duct Alveolus Blood-air barrier)

Cells	Alveolar cells Type I Type II Club cell Goblet cell

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