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How the lungs and the diaphragm work together. BY: Shelby Drumheller

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Shelby Drumheller

on 12 January 2013

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Transcript of How the lungs and the diaphragm work together. BY: Shelby Drumheller

Shelby Drumheller
6th Grade
Mrs. Jackson How the lungs and the diaphragm
work together. PURPOSE The purpose of my science project is to show people how the lungs expand and contrast with the help of the diaphragm with just balloons, soda bottles, and a couple more of materials. This experiment could help people learn more about how your lungs work with the help of the diaphragm and how you breathe faster when you exercise. HYPOTHESIS My hypothesis is that when I blow up the balloon it will represent the lungs and a balloon stretched over the bottom of the cut out bottle will represent the diaphragm. So when I pull and push the balloon on the bottom of the bottle (which represents the diaphragm) and repeating this, it will show how the the lungs fill with air. BACKGROUND RESEARCH (Www.nhibi.nih.gov)
I learned how the lungs allow your body to take in oxygen from the air. The intake of oxygen and removal of carbon dioxide is called gas exchange. Gas exchange is part of breathing.

The diaphragm is a dome shaped muscle underneath the lungs that helps the chest expand and contrast during respiration- when you inhale, the diaphragm moves down and the ribcage expands and it allows the lungs more room to expand. Www.mcqueens.net
I learned that breathing occurs when the diaphragm and inter coastal muscles move causing the chest cavity to change in size. An average person takes 15,000 breaths per day. Www.umm.edu.htm I learned that the diaphragm is located below the lungs- It is also the major muscle of respiration. When you inhale the diaphragm contracts and flattens and the chest cavity enlarges- the contraction creates a vacuum and it pulls air into the lungs- when you exhale the diaphragm relaxes and returns back to a dome like shape and air is forced out of the lungs. Www.science.howstuff.com I learned that when you inhale the diaphragm and the inter coastal muscles contrast and expand the chest cavity. (Inter coastal muscles are the muscles between your ribs in the chest cavity.) This expansion lowers the pressure . Air then flows in thru the airways. (From high to low pressure and inflates the lungs.) MATERIALS 1.) Latex Balloons
2.) Clear Plastic 1 liter soda
3.) Clear tape.
4.) Rubber Bands
5.) Y shaped tube. Procedure. Step 1. Cut the soda bottles bottom end so that it has a large circle on the bottom and the spout on the top. Step 2.
Put two balloons on two of the Y shaped tubed holes. Step 3. Put the 3rd hole inside the bottom and out the spout of the soda bottle. Step 4. Take another balloon and cut the top of it off. Step 5. Put this balloon on the bottom of the bottle so that it covers the circular opening. Step 6. Put a rubber band around this balloon. Step 7. To work the model pull on the bottom balloon and watch as the two balloons on the inside of the bottle grow bigger. As you push the bottom balloon into the balloon, watch the two balloons shrink. RESULTS. By doing my experiment I pulled the part of the
balloon that represents the diaphragm down and up and kept repeating this motion and it did show the balloon (that represents the lung) expand and contract. CONCLUSION.
In my experiment I cut the bottom of the plastic bottle and placed a balloon that I cut the neck off and stretched the remaining part on the bottom of the bottle. This represents the diaphragm. I stretched another balloon over the neck of the bottle with the balloon hanging inside. This represented the lung. I then pulled on the latex balloon (diaphragm) on the bottom of the bottle. This showed the diaphragm contracting, when it contracts it decreases the air pressure within the bottle (chest cavity) creating a difference in air pressure. If the air pressure inside is less the outside then air will have a tendency to move from pressure to pressure. When I did the opposite and pushed up on the diaphragm, the air pressure increased within the chest cavity forcing out air in the lungs. I kept pulling diaphragm up and down and it showed how our lungs fill with air. In my original hypothesis was correct, as it showed how the lungs increased and decreased with air. It was a really neat experiment because I never knew how important the diaphragm was for the lungs!
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