I understand that when we breathe the air goes to our lungs and then send the waste air out (very simplified). But how does our nose and mouth move to breathe, and how do they make air go into them and push out of them?
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Your nose and mouth don’t do the breathing, they’re just the holes that air moves through. Breathing is controlled by your diaphragm – that’s a big muscle that sits just beneath your lungs. When you inhale, your diaphragm contracts and flattens out. This creates more volume in your chest cavity. Your lungs expand into this area and as they expand, pull air in through your nose or mouth. When you exhale, your diaphragm relaxes and pushes up. This pushes your lungs up as well and that pushes the air out of your lungs through your nose or mouth.
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