Demonstrates how the lungs are filled and emptied with air through contraction
and relaxation of the diaphragm muscle. The two balloons act as the lungs and
the rubber sheet acts as the diaphragm. Pulling the rubber sheet downward
created pressure within the chamber causes the balloons to expand. Releasing the
rubber sheet deflates the balloons. Includes activity guide. Additional Info: Lung Apparatus Package Size(L x W x H): 10 X 8 X 8 (IN) Categories: Biology, Models HTS Code: 9023.00.0000 Country Of Origin: CHINA