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by Kathryn Martinez
May 12, 2001
Have your kids ever asked how do you breathe? What are lungs? What do they look like and how do they work? Have you ever wondered this yourself? Here is a super simple, super easy project to explain this. Goes well with a study of anatomy, life science, and/or biology. How about studying diving and snorkeling? Just a good, all around activity.
One 1-liter or 1-quart clear plastic bottle*
One large balloon
One small balloon
Two rubber bands
across the bottom of the bottle acts like a diaphragm. This is the flat
muscle at the bottom of the chest cavity. This muscle forces air in and
out of your lungs. Your lungs do not inflate or deflate by themselves
a muscle, your diaphragm, is pulling or pushing so that you can breathe.
*Vegetable oil bottles work well for this. So do drink bottles, the disposable kind, not the kind you re-use.