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Diagram of the air tubes with the lung tissue removed.

Diagram of Air Tubes in the Lungs

Diagram of the air tubes with the lung tissue removed.

Section of lung, showing small air tubes and branch of pulmonary artery.

Section of Lung Showing Air Tubes

Section of lung, showing small air tubes and branch of pulmonary artery.

Section of lung, showing general relations of division of air tubes.

Section of Lung Showing General Relations of Divisions of Air Tubes

Section of lung, showing general relations of division of air tubes.