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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 the body when you inhale (Breathe in) air enters through the mouth and into the lungs. and then exhale (Breathe out) carbon dioxide (CO2). 5 people found this useful.Edit. perfect Mix of oxygen and Carbon dioxide enter your body through your mouth and go through your breathing pipe to your lungs it then it goes past a paperthin skin which unox â¦ igenated Blood goes past and then your blood is oxigenated!.