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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.
Trachea, Bronchi and Bronchioles. Air for the lungs enters the body through the mouth, which leads into the trachea. At the base of the trachea, it breaks into two bronchi which further sub-divide and branch, forming a bronchial 'tree'. Cartilage in the trachea and bronchi keep the airways open and prevent them from collapsing.