1. Modeling Lungs 1. Question:
What enables you to take in and breath out air?
2. Hypothesis:
3. Materials:
Ballon
2-L plastic bottle with the bottom cut off
30-cm circle cut from plastic bag
Masking tape
Rubber band

2. 4. Procedure:
STEP 1: Push the closed end of a balloon through the mouth of the bottle. Stretch the open end of the ballon over the top of the bottle.
STEP 2: Fold the 30-cm circle in half twice. Twist about 2.5 cm of the folded corner, and secure it with a short piece of masking tape to make a handle.
STEP 3: Cover the open bottom of the bottle with the plastic circle so the handle is on the outside of the bottle. Secure the plastic tightly to the bottle with a rubber band. There should be some slack in the plastic.

3. STEP 4: Draw the following chart.
STEP 5: Gently push and pull on the handle to move the plastic in and out. Record what you observe.
STEP 6: Hold the bottle so its mouth is near your cheek, and move the surface of the plastic in and out. Record what you observe.
Observations
Step 5
Step 6
Step 7

4. STEP 7: Put your hands at the bottom of your ribs, and take a deep breath. Record what you observe (how your body moves).
5. Conclusion:
6. Explain which parts of the model represent the lungs, chest cavity, and diaphragm.
7. From your observations, draw a conclusion about how your diaphragm moves in your body.