Is it true that our blood in blue until it meets with outside oxygen?

Is it true that human blood is blue until it hits oxygen?

  • Answer:

    Yes, human blood is blue when it has carbon dioxide in it rather than oxygen. When it passes through the heart and lungs to become oxygenated on its journey throughout the body it becomes red.

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Yes, human blood is blue when it has carbon dioxide in it rather than oxygen. When it passes through the heart and lungs to become oxygenated on its journey throughout the body it becomes red.

Jodi Scaife

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