I know that the diaphragm expands causing the air to leave the lungs. But what happens when the diaphragm contracts? How does this draw air in to the lungs?
In: Biology
It’s like a syringe: you pull to fill it with air, and you push to empty the air out through the needle.
The diaphragm muscle can do this, and so can your chest/rib muscles. You can actually activate them either or, if you concentrate (breathe “with your stomach” vs. breathe with your chest).
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