The document provides instructions for making a lung model using common household items. The model uses a cup with a hole drilled in the bottom to represent the rib cage. A balloon is inserted through the hole and attached to a straw to represent the lungs. A square of plastic sheeting cut from a garbage bag and attached to a strip of tape is used as a diaphragm muscle. Pulling down on the diaphragm causes the balloon to inflate, representing inhalation, while pushing it up deflates the balloon in exhalation. The model demonstrates the basic functioning of lungs and diaphragm.

1. Making a Lung Model 9th Annual Day of the Teacher Conference March 26, 2011 CSUEB Concord Campus Charles Reynes Elementary Science Specialist Castro Valley, USD

2. Making a Lung Model Materials 1 cup with hole 1 balloon 1 large rubber band Sturdy tape such as electrical tape, Scotch tape will also work.

3. Making a Lung Model Cut a 6” x 6” square of plastic sheeting from a garbage bag. I fold the bag so that I can cut several squares at once. Fold each square in half. The next slide will show you how to attach the tape handle.

4. Making a Lung Model Attach a quarter of the tape to one side of the fold. Turn the plastic over and fold the tape back on itself, attaching the remaining one-fourth of the tape to the other side of the plastic fold.

5. Making a Lung Model Drill a hole in through the bottom of the cup. The hole needs to be slightly larger than the straw, but small enough to create a tight fit when the straw is inserted through the opening of the balloon. Insert the balloon through the hole. Any narrow, blunt object will make this task easier.

6. Making a Lung Model Cut about 3-4 inches off the end of a bendy straw. Insert the straw into the balloon. The balloon forms an air tight seal between the straw and the hole.

7. Making a Lung Model Center the diaphragm with the tape handle out. Secure the diaphragm with a rubber band.

8. Push up on the diaphragm and the balloon lung exhales. Making a Lung Model Pull down on the diaphragm and the balloon lung inhales.