why does your blood turn red when mixed with oxygen?

Question:

I am a Girl Scout leader. Today I was teaching the girls about taking their pulse and boy did I get a ton of questions. Being a trained AF medic I was able to answer all but one. I promised a girl to get the answer next week and she thanked me profusly. I guess she's been curious about this for a while.

Answers:
Hemoglobin is the pigment in the red blood cells that carries oxygen and co2. When it carries o2, it is a brighter red than when it carries co2.

it might seem to meld into red, but actually blood is red because of the existense of iron in our blood, which makes blood red.

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why does your blood turn red when mixed with oxygen?

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