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Are there any parts of the human body that get oxygen directly from the air and not from the blood?
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Are there any parts of the human body that get oxygen directly from the air and not from the blood?

User Tomas Kulich
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Answer:

Yes. Upper-layer skin cells and the cells in the front surface of the eyes get a significant amount of oxygen directly from the air rather than from the blood. Human bodies have a huge demand for oxygen. As a result, the oxygen that is able to passively diffuse into the body directly from the air is not nearly enough to run the whole body.

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User Ensecoz
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