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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.
The air passages When we inhale, air enters the body through the nose. The air flows from the nostrils to the nasal passages. The nasal passages are lined with tiny hairlike structures and a sticky substance called mucus. These structures and the mucus filter dust and dirt from the air.