Gather together scissors, 6 inches of surgical tubing, 3 balloons, 2 rubber bands, modeling clay, a plastic 1 liter bottle and a 3-way hose connector.
Fit the surgical tubing into one of the openings in the hose connector.
Use the modeling clay to make an airtight seal around the area where the tubing and the hose connector meet.
Place a balloon around each of the remaining 2 openings in the hose connector.
Tightly wrap the rubber bands around the balloons where the balloons and hose connector meet. The seal should be air tight.
Measure one inch from the bottom of the bottle and cut the bottom off.
Place the balloons and hose connector structure inside the bottle.
Use the clay to seal the plastic tube into the narrow opening of the bottle at the neck.
Tie a knot at the end of the remaining balloon and cut the large part of the balloon in half horizontally.
Stretch the balloon over the bottom of the bottle using the half with the knot.
Gently pull down on the balloon from the knot. This should cause air to flow into your lung model.
Fit the surgical tubing into one of the openings in the hose connector.
Use the modeling clay to make an airtight seal around the area where the tubing and the hose connector meet.
Place a balloon around each of the remaining 2 openings in the hose connector.
Tightly wrap the rubber bands around the balloons where the balloons and hose connector meet. The seal should be air tight.
Measure one inch from the bottom of the bottle and cut the bottom off.
Place the balloons and hose connector structure inside the bottle.
Use the clay to seal the plastic tube into the narrow opening of the bottle at the neck.
Tie a knot at the end of the remaining balloon and cut the large part of the balloon in half horizontally.
Stretch the balloon over the bottom of the bottle using the half with the knot.
Gently pull down on the balloon from the knot. This should cause air to flow into your lung model.