4 stage cross-section of the bronchus demonstrating the tissue changes occurring in asthma and chronic bronchitis. 4-stages:
- normal bronchus
- hypersecretion of the mucous gland
- swelling with lymphoid aggregations
- smooth-muscle spasm
The model includes: cartilage, mucous glands and plug, spiralling smooth muscles, and the fibroelastic connective tissue and epithelial layers of the bronchus. All stages rotate on hinge pin. Diameter: 3.8 cm, size: 10 cm, weight: 0.1 kg