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. This site discusses atmospheric pressure, which is usually not covered in depth until high-school chemistry so you may need to define this for students if they are not familiar with it.
Next, discuss the combustion process in terms of producing energy via respiration. You can use the information on The Oxygen Machine teacher sheet to help you with this discussion. Light a candle and ask students to observe the behavior of the fire for five minutes.
Then put a glass or a jar on top so that the fire will eventually go out. Ask students what will happen when the glass is put on top of the fire. Also ask students what happens to the glass or anything else that comes near the flame it gets hot because of the release of heat energy.
Now ask students to think of food again as the source of energy. Help them to establish a relationship. Begin by pointing out that fire is only one form of oxidation!
Oxidation also occurs in your body: When the carbohydrates and fats in your body combine with the oxygen you inhale, they produce carbon dioxide CO 2 and release energy, oxidization. Students should discuss the relationship in terms of oxidation. After students have read the information on the websites, review the information with them. Our bodies make the energy we need to run around, play and do schoolwork, by burning the food we eat. Think of this a bit like a candle burning.
To burn our food, we need oxygen , which we get from breathing in the air around us. This has a very important job. Nitrogen slows down the burning process so you get enough energy through the day, bit by bit. If you breathed pure oxygen, the energy from your food would be released all at once. So forget candles. As mentioned, true liquid oxygen would likely kill you pretty quickly if you tried to drink it.
And swallowing an excessive amount of oxygen into your throat makes the flammable fat in your throat react with the oxygen immediately. And burn up. Liquid oxygen is used as an oxi- dant for liquid fuels in the propellant systems of missiles and rockets. Even eating snow can kill you if you eat enough. Another problem is that if you managed to swallow a lump of frozen oxygen is that it would boil in your stomach and expand so much that you might burst.
It could also cause you to burst into flames or even explode, when a flammable material such as the fat in your body is immersed in liquid oxygen it doesn't take much for oxidisation fire to start, it can happen spontaneously. Arpan Sandhu answered this.
0コメント