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I'm not exactly sure what you're asking, so I'll answer this two ways.

oxygen is used in our bodies at a cellular level. It is used and carbon dioxide is a byproduct of its function. Oxygen is carried in the blood stream on your red blood cells on a transport car called hemoglobin. This allows for the oxygen to get to the cells that need it. When the carbon dioxide is produced, it is released into the blood stream. Our bodies know when there is more carbon dioxide because it is acidic in the blood, allowing for our body to increase our respirations and breathe off the carbon dioxide (co2)---for our bodies to do this, this of veins as walls of a house, and the walls keep in the CO2. On the outside of the house is the air, like our lungs, so a door needs to be opened to allow the CO2 to be transferred across. There are tiny little spaces between each cell we have, and the ones in the lungs allow for oxygen and carbon dioxide to cross (the doorways).

When we're sick with a bad cough, with a chest infection, the doorways can be plugged with the mucous and cause problems with how the oxygen and c02 cross from the blood to the lungs, and the feeling that we cannot breath. (this on top of a few other things)

Hope that made sense!

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15y ago

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