Your lungs are a pair of large organs in your chest and are part of your respiratory system. When you breathe, air enters your body through your nose or mouth.It next passes through your windpipe (trachea) and through each bronchus, and finally goes into your lungs. When you breathe in, your lungs expand with air.This is how your body gets oxygen. When you breathe out, air goes out of your lungs. This is how your body gets rid of carbon dioxide.hen you breathe in, your lungs expand with air. This is how your body gets oxygen. When you breathe out, air goes out of your lungs. This is how your body gets rid of carbon dioxide.
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