So, we learned how we breath the contraction of the diaphragm is what occures when we inhale, and it relaxes when we exhale. When we breathe, the ribcage expands to allow the lungs enough room to inflate. When the diaphragm contracts the air rushes through the trachea and into the lungs. They deflate when the diaphragm goes back into it's resting position that part requires a muscle contraction of the diaphragm.
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