what is breathing
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Yogita Ingle 7 years, 6 months ago
Humans breathe through something called the respiratory system. This system is made up primarily of our lungs and windpipe. We breathe in using a muscle called the diaphragm. It flattens out making our lungs expand and fill with air. When we breathe in, air gets forced through our nose or mouth, down our windpipe, and into bronchi tubes in our lungs. These bronchi tubes branch out and get smaller and smaller, like the roots or branches of a tree.
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