Meet Your Lungs · Lungs
A pair of soft, air-filled organs that load your blood with oxygen.
Your lungs are two soft, spongy organs filling most of your chest. They aren't muscles and they can't move themselves — think of them as very fine sponges that air is drawn through, about 20,000 times a day.
Their whole job is a swap: pull oxygen out of the air you breathe in, and dump carbon dioxide into the air you breathe out. Everything else about them — the branching tubes, the springy tissue, the enormous inner surface — exists to make that one swap fast enough to keep you alive.
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