when u suck in air it is called oxygen, when it goes out it is called carbon - dioxide. when the carbon - dioxide leaves your body it then goes into the atmosphere and it is recycled by the trees and becomes new air... i am not sure of this answer, so i think that u should check another resource before using this answer. thankyou!
it goes where the other carbon - dioxide goes. back into the air, the same place where the air from your mouth goes.
Windpipe!
The mouth or nose inhales oxygen. Then the oxygen goes into the lungs.
Oxygen enters your nose,then goes through the trachea,to the bronchi,and last to your lungs.
carbon dioxide is taken through the leaves, and oxygen goes out. !
When we inhale through the nose, we breathe in oxygen and some carbon dioxide. When we exhale, there is more carbon dioxide than oxygen. This is because the oxygen is absorbed and converted by the lungs into carbon dioxide.
The lungs are the organs where oxygen enters the body and carbon dioxide leaves it through the process of respiration. Oxygen is taken in when breathing and carbon dioxide is released when exhaling.
In exhaling, the oxygen mixes with the surrounding atmosphere. On inspiration, the oxygen, along with other gasses present, enters the nose and gets warmed and moisturised while dust is filtered out. After that it leaves the nasal cavity and enters the pharynx, just behind the soft palate and the tongue, and eventually passes down the larynx into the (lungs,) bronchi and through the alveoli into the bloodstream.
Oxygen enters your nose,then goes through the trachea,to the bronchi,and last to your lungs.
Because you suck in air through your mouth or nose and it goes into your lungs... it's called breathing =)
Blood leaves the penis and goes to aid bringing oxygen to the muscles in use.
Remember veins back to the heart. This goes into the heart to deliver oxygen.
Remember arteries away from the heart. This goes into the lungs to pick up oxygen.