"Skin coloration is determined by the amount of pigment in the skin and the blood flowing through it. Blood that is saturated with oxygen is bright red. Blood that has lost its oxygen is dark bluish-red. People who have a large quantity of blood deficient in oxygen tend to take on a bluish discoloration called cyanosis..." http://www.nlm.nih.gov/medlineplus/ency/article/003215.htm jr
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