Respiratory tract
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The respiratory tract is the subdivision of the respiratory system involved with the process of conducting air to the alveoli for the purposes of gas exchange in mammals. The respiratory tract is line
Trachea Mainstem bronchus Lobar bronchus Segmental bronchus Bronchiole Alveolar duct Alveolus
3D still showing increased mucus
3D still showing constricted airways
Bronchiole
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The bronchioles are the smaller branches of the bronchial airways in the lower respiratory tract. They include the terminal bronchioles, and finally the respiratory bronchioles that mark the start of
A lobule of the lung enclosed in septa and supplied by a terminal bronchiole that branches into the respiratory bronchioles. Each respiratory bronchiole supplies the alveoli held in each acinus accompanied by a pulmonary artery branch.
Lungs showing bronchi and bronchioles
Cross sectional cut of primary bronchiole