Purpose: Students make a working model of a pair of lungs to see how the diaphragm, lungs, and trachea work together. Materials: Plastic bottle with lid Straw Two rubber bands Two balloons Gum or modeling clay Procedure Cut off the bottom of the bottle Cut off the neck of the balloon Secure balloon over the […]

I receive commissions for purchases made through links in this post. Please see our full disclosure policy for more details. Thank you for supporting Half-a-Hundred Acre Wood through your purchases.