These pictures represent how oxygen enters our lungs. The straw in the picture represents the trachea while the green balloon on the bottom represents the diaphragm. In picture one, everybody can see that when the diaphragm is pulled downward the balloon is full of air similarly in our body, the diaphragm must move down then the air will go through the trachea and into our lungs. Also, as the diaphragm returns to it's original position, carbon dioxide will leave the body through the trachea.
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