The diaphragm is the muscle underneath the lungs
During exhalation, diaphragm relaxed
During inhalation, diaphragm contracts and flattens out allowing lungs to open up
The larger the volume, the lower the pressure
Pressure gradient goes from high to low and oxygen flows down the pressure gradient
When pressure in lungs is lower than the pressure outisde the lungs, air flows in
When pressure in lungs is higher than the pressure outside the lungs, deoxygenated air flows out
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