• Question: Why is our blood red

    Asked by ep to Claire, Liad, Mako, Ryan on 18 Jun 2015. This question was also asked by Kitcat.
    • Photo: Claire Bryer

      Claire Bryer answered on 18 Jun 2015:

      Our blood is red because our red blood cells have something called haemoglobin in them. Haemoglobin carries oxygen around our body. Haemoglobin contains iron and when oxygen binds the iron this appears red. Have you noticed that your veins look blue? This is because this contains the blood going back to the heart and lungs, which has lost its oxygen and is going back to get some more!

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