Today we’re going to build a model to show how the lungs inhale and exhale.
What you will need:
A plastic bottle
A plastic pipette or a long, thin tube
A cork or something else to plug up the top of the bottle
A screwdriver or something else you can use to poke a hole through the cork
► Cut the pipette so that both ends are open (now you have a tube).
► Make sure the cork fits snugly in the top of the bottle and then poke a hole through it. You’ll need to squeeze the tube through the hole. Air should only be able to get through the tube, so you might need to use tape to plug up any cracks.
► Put a balloon on one end of the tube. Wrap tape around it to make sure it’s attached tightly.
► Cut a hole in the bottom of the plastic bottle.
► Cut off the end of a balloon then wrap the balloon around the bottom of the bottle. Use tape to help hold the balloon in place. Be careful not to tear the balloon.
► Suck hard on the tube so that the balloon attached to it has very little air in it. Keep sucking as you put the cork into the top of the bottle.
► Pull on the balloon wrapped around the bottom of the bottle. The balloon inside the bottle should fill up with air, just like your lungs fill up with air when you inhale. Stop pulling, and the air should leave the balloon inside the bottle, just like when you exhale.
(MICHAEL KEARNEY, STAFF WRITER)
What happens if you poke a hole in the bottle? Does the balloon inside the bottle still fill up with as much air? This shows what would happen to your breathing if you had a hole in your chest.
The lungs help us to take in oxygen and get rid of carbon dioxide. Why do people need oxygen? Where does the carbon dioxide come from? What else do the lungs do? Try doing some research at the library or on the Internet.