• Question: why is are blood red?

    Asked by siimpleetee to Mona on 14 Jun 2011.
    • Photo: Mona Gharaie

      Mona Gharaie answered on 14 Jun 2011:

      Blood is red because of the hemoglobin (the molecule that carries oxygen around) which is held in the red blood cells. Hemoglobin contains four atoms of iron which can be in an oxidized state, i.e with an atom of oxygen attached to it, making it red, or in a non-oxidized state, when it is dark red-blue (maroon). If you are interested to know more about red bloos cells you cab read from the below link:
      http://en.wikipedia.org/wiki/Red_blood_cell

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