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The Journey of an Oxygen Molecule
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Now in the form of the carbon dioxide molecule, it will go out of the body the same way that it went in. And that's the journey!
Now the person has exhaled, the carbon dioxide molecule goes down to the dome - shaped diaphragm. It separates the two lungs from the other organs in the body, and when we inhale, it goes down, and in this case, when we exhale, it goes up.
The air including oxygen go to these tiny air sacs, called the alveoli. Their job is to exchange the gases, so the oxygen molecules all become carbon dioxide molecules.
After the molecules enter the bronchi, they get divided and goes into smaller tubes, called the bronchioles. There are as many as 60 000 of these, half in each lung.
Inside the lungs, the oxygen goes to these big tubes in the lungs called the bronchi.
The molecule goes down the trachea, which goes down to the rib - cage - protected pair of lungs.
The Journey of an Oxygen Molecule through the Respiratory System
The molecules then go down this wind pipe (trachea).
Firstly, we inhale air through our nose (oxygen).