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Earlier discussion
1 older comment kept for context.
CHUKA MIKE
When we take a breath, we pull air into our lungs that contains mostly nitrogen and oxygen. When we exhale, we breathe out mostly carbon dioxide. Why do we do this?
Our bodies need oxygen to function. After we take a breath, the lungs transfer oxygen to our blood to be transported all over our bodies to help our cells work. Think about it — when you are running, you breathe more heavily to get more oxygen. Oxygen helps our cells work harder by breaking down the nutrients we get from food like sugars. With sugars and oxygen, our cells can create the energy they need to function.