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When you breath, it is not you expanding your lungs directly. It is a muscle called your diaphragm that makes you breath. It is located below your lungs. When you breathe in, your diaphragm pulls down, making more room in your chest, which your lungs then expand to fill up. This expansion leaves more room in them for air, so air rushes in and fills them. The opposite happens when your diaphragm pushes up making less space and your lungs contract, pushing air out. You diaphragm is just a regular muscle. For the same reason that you cannot flex your arm so hard that you tear your arm off, your diaphragm can not flex so hard that it pops you lungs.

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15y ago

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