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Actually, the blood is said to be blue in colour but it becomes blue when it comes in contact to oxygen!
Each hemoglobin protein is made up subunits called hemes, which are what gives blood its red color
Each hemoglobin protein is made up of subunits called hemes, which are what gives blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen.