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A member asked:
Please explain substance gives blood its dark red color?
A doctor has provided 1 answer
Hemoglobin: Hemoglobin is a complex chemical which carries oxygen around to the tissues. When it combines with oxygen it gets bright red which is the usual color we associate with blood, when the oxygen is taken away it gets to be a darker color.
Answered 4/20/2014
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What gives blood its red color?
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