There is a brief experiment performed in the Development where students should light a candle. You could choose to do this as a demonstration instead, in which case you would just need one candle, a match, and a glass or jar. Ask one student to come to the front of the class to blow up a balloon. After students have read the story, discuss the questions posed on the esheet students can record their answers on The Oxygen Machine student sheet.
Use these questions to get students started in thinking about oxygen and the body. Do not worry so much at this point about right or wrong answers. Next, project the introductory page from Exposure on the PBS website and read the three questions on this site slowly to the students to stimulate their thinking about respiration. If you are not able to project the page to the whole class, copy the questions on the board.
They are:. To help students understand the concept of respiration, review the following information with the students, which can be found on the student esheet. The drawing on the Mechanics of Respiration student sheet illustrates the basic parts of the body involved with respiration. Respiration is the process that allows us to breathe in oxygen and exhale carbon dioxide.
Oxygen is then used in our cells as the fuel that transforms the food we eat into energy. Students will go through a series of resources to learn about: the respiration process basic mechanics , its importance as fuel to our cells, and its importance in health and disease. Basic Mechanics of Respiration Using the esheet, students should go to and read the Mechanics of Respiration to learn about the process of respiration.
This resource will introduce them to the structures and functions of the respiratory system. They should focus on 7 and 8 because they review how oxygen is involved in energy production; the other information reviews the respiration process.
When you breathe out, air flows out of your lungs. The balloon inside the bottle is like one of your lungs. The bottle is like your ribcage. Procedure Hold the bottle so you can see the balloon inside representing the lung.
Gently pull down on the knot. What happens to the balloon inside the bottle? Let the knot come back to its neutral position and then gently push it in. What happens to the balloon inside the bottle now? Repeat these steps a few times. Does this resemble breathing? Which part resembles breathing in and which part resembles breathing out? If your model is working well, air will rush into the balloon when you pull the knot outward and flow out when you push the knot inward.
Why do you think this happens? When we breathe in a relaxed way our diaphragm—the muscle that separates the chest cavity from the abdominal cavity—moves to expand and contract the chest cavity.
How is that similar to what you do with your model? Push and pull the knot a few more times. Using the model can you find which movement of the diaphragm creates inhalation and which creates exhalation? Feel your ribs and breathe in deeply then exhale. Can you feel your ribcage expand and fall back? The center of our diaphragm moves more when we take deep breaths: up to four inches! In the model you made, the ribcage the plastic bottle is fixed, but you can move the "diaphragm" more by pulling the knot farther and pushing it in more.
Try it out. How does that change the volume of air that flows in and out of the lung balloon? Extra : Add a windpipe to your model. To do this take the balloon out of the bottle and slip its neck over a straw; secure the balloon to the straw with tape.
Hang the balloon—and a short section of the straw—in the bottle's neck, and use clay to hold it in place. Make sure the clay makes an airtight seal around the straw and the bottle neck. No change is needed to the second balloon that closes off the bottom of the bottle. Can you see which part models the windpipe?
Why is hydrogen important for life? Why is oxygen important in combustion? See all questions in The Importance of Oxygen. Impact of this question views around the world. Here are ten reasons why oxygen matters so much:. Oxygen plays several roles in the human body. One has to do with the transformation of the food we eat into energy. This process is known as cellular respiration.
This provides the energy you need to live. It needs a lot of energy, which means a lot of cellular respiration. To just survive, the brain needs around 0. It needs 1. To create that energy, the brain needs a lot of oxygen. Your immune system guards your body against dangerous invaders like viruses and bacteria. Oxygen fuels the cells of this system, keeping it strong and healthy.
Breathing oxygen purified through something like an air sanitizer makes it easier for your immune system to use the oxygen.
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