What happens in our bodies during a breath to cause the atmospheric pressure to suck the air?
In: Physics
The muscles of the chest wall and diaphragm flex, increasing the size of the chest cavity and the volume of the lungs. Because the volume of the lungs have increased with the same amount of air in them, the air pressure within decreases and the external air pressure forces more air into them provided there is a path to do so (e.g., the trachea isn’t blocked).
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