Tracheobronchial tree is the part that transmits air from the upper respiratory tract to the lungs.

The tracheobronchial tree is the anatomical and functional segment of the respiratory system that conducts air from the upper airways to the lung parenchyma. It is composed of the trachea and the intrapulmonary airways, including the bronchi, bronchioles and respiratory bronchioles. Different histological characteristics are seen at each level and serve specific purposes.

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