In the human body, oxygen combines with carbon as a part of our energy-making processes. This combination of oxygen and carbon results in a waste gas: carbon dioxide. When we inhale, we take in oxygen (among other things). It meets up with cells in the lungs and the cells in your blood to oxygenate them. Then, when you exhale, you get rid of some of the carbon dioxide. This process is called respiration (the exchange of oxygen from outside your body with carbon dioxide from your cells).
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