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Which organ supplies a human's bloodstream with oxygen from the air, which can then be taken through the blood to the muscle cells of the arm?

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ThatOneOcelot
The lungs supplies the bloodstream with oxygen. When we breathe in, out lungs fill with oxygen and that oxygen is taken to the heart to keep our body going.
MaryD999

The lungs are very important for supplying the body's many cells with oxygen, which is in the air.

(From  StudyIsland)

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