Name: Reskin School
A sixth grade class wants to know if, in the human body, blood is ever blue.
Sure, close to it. It's a very dark bluish red in the veins. Just look
at your arm veins.
Generally blood is red or dark red. It appears bluish through our skin,
so that's why our veins appear blue. Once blood has exchanged its oxygen for carbon
dioxide, it gets a little darker, but not really blue. There are some interesting
genetic studies on a group of people having blue pigment in their skin, though...
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Update: June 2012