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What happens when exhale

User IPO
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When you exhale you breathe out carbon dioxide which is good for plants
User Sandye
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When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
User CommandZ
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