Learn about The Breathing Process in this educational video from dizzo95.
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Male Speaker: The movement of the ribs increases the volume of the chest. Result; the air in the lungs is at a lower pressure than the air outside. Air rushes down the pipe, the trachea from the mouth, filling the lungs, and breathing out making simpler. The muscles attached to the ribs relax, the weight of the rib cage forces air out of the lungs. So is that a -- not quite. You may have noticed that you can breathe and your ribs hardly move, how come? Something else must be changing the volume of the chest, another muscle. This time one you need to see, the diaphragm. As we breathe, it contracts and relaxes.