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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
In addition to the lungs, you need the mouth and nose, the trachea. and diaphragm to breathe. As the diagram on the right illustrates, when you. inhale, fresh air enters through the nose and mouth. and travels to the lungs via the windpipe (trachea). Once in the lungs, the air moves through a series of.