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When you breathe in, oxygen flows down your windpipe into your two lungs. At the same time, they are expanding and your diaphragm moves down towards the floor to allow the lungs to expand/inflate. When you breathe out, carbon dioxide gas leaves the body. At the same time, your lungs are deflating and your diaphragm pushes upwards to force the carbon dioxide out of the lungs. The 2 steps above repeat again and again from the time you are born till the time you die.

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15y ago
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8y ago

Oxygen comes in from the air into your lungs.

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Q: What happens to the body during breathing in and out?
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