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You breath in oxygen which is O2

What is exhaled is CO2 or carbon dioxide.

The reason for this is the human metabolism is based on the reaction between Glucose (C6H12O6) and oxygen gas (O2). The oxygen reacts with the glucose to produce carbon dioxide and water to release energy for out bodies to use.

6O2 + C6H12O6 --> 6CO2 + 6H2O + energy

We need to get rid of the carbon dioxide because it is toxic.

The water produced is of little consequence as our bodies are mostly water anyway.

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15y ago

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