what happened when we respire
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When you breathe, you absorb oxygen from the air. You also get rid of carbon dioxide, a gas that's produced when your body's cells use up oxygen. ... These sacs take oxygen from the air you breathe and pass it into your bloodstream. They also collect carbon dioxide from the bloodstream for you to breathe out.
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When we respire, the food present in the body cells will undergo chemical change. This process produces energy and carbon dioxide.
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