Oh man, I sooo learned this back in high school in AP Bio... let's see if I can remember...
Gah! I can't. I had to look it up.
The hemoglobin in the blood stream is made to absorb oxygen which is picked up in the lungs, and through the blood stream it is carried to all the cells, where oxygen is required in the process of controlled burning of nutrients inside the cell which supplies us with energy.
The body only extracts oxygen from the air, that we breathe.
It is taken into the lungs, where it is filtered by the alveoli and then absorbed into the blood capillaries in lung tissue. Where the oxygen fuses with the hemoglobin in your blood.
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