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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.
Air enters your body through your nose, then enters the pharynx through the two nasal passages. Then it passes into the larynx and then into the trachea though an opening called glottis. The trachea divides into two bronchi (one for each lung), and further branches into numerous bronchioles. At the end of each bronchiole, there is a cluster of air sacs called alveoli. It is inside the alveoli that gas exchange actually takes place.