Size(cm)：21x15x23   

The model shows the samll branches of principal bronchus:

1. Section of bronchiole of no cartilage.

2. The relation between pulmonary alveoli and terminal bronchiole.

3. The structure of alveolar sac anf alveolar duct.

4. The capillary rete in the alveolar sapta.

Made of PVC plastic and mounted on plastic base.