This is where the air you breathe is processed and the oxygen is removed and transferred to the blood stream for distribution throughout your body.
Oxygen is the cream of the air you breathe. When air comes into your lungs, the oxygen is extracted from it, "bottled" in red blood cells (hemoglobin) and then sent off on the blood stream assembly line for distribution. When they reach the tissue, the "bottles" exchange oxygen for waste products (carbon dioxide and water) and then carry these wastes back to the lungs where they are flushed out when you exhale. The bottles are then ready to pick up more oxygen and start the process all over again.
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