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The oxidation (burning, if you wish) of the carbon in sugar and fat molecules,

that occurs within your cells.

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Wiki User

12y ago
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5mo ago

The carbon dioxide we exhale comes from the food we eat. When we metabolize carbohydrates, fats, and proteins for energy, carbon dioxide is produced as a byproduct. This carbon dioxide is then released into our bloodstream and eventually expelled from our lungs when we breathe out.

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Q: Where does the CO2 you breathe out come from?
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Oxygen. You breathe out CO2


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