Demonstrate both set of lungs simultaneously for better lung comparison with the new interconnected airway system. Provides an impressive, unforgettable, hands-on demonstration of the effects of prolonged smoking by using real swine lungs. Compare the ventilation of both sets of lungs simultaneously, or shut off one of the upper valves to inflate only one set of lungs. Utilize the BioQuest preserved healthy lungs and the BioQuest preserved smoker's lungs to demonstrate to students the differences in color, texture, and fragility of the swine lungs. Smoker's lungs have a palpable simulated internal tumor and a physical simulated external tumor to encourage students to feel the texture of the lungs, and to remember that smoking is a known cause of lung cancer. Kit includes: an interconnected airway system with dual trays, air pump, one pair of reuseable, normal-inflatable swine lungs with guide; one pair of simulated smoker's lungs with guide, and one section of dried swine lung with a storage container. Also available with single rack. Contains natural tissue color may vary