Myth - Color of blood
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In humans, some people say that arteries are red because they have oxygen, that veins are
blue because they lack oxygen, and that blood from veins turns red when exposed to the oxygen-rich
air. In reality, blood with more oxygen is brighter red and blood with less oxygen is
darker red. Since the oxygen-transferring protein hemoglobin is held within red blood
cells, it doesn't have direct contact with air and doesn't react. The illusion of blue
veins is created by the skin only allowing certain wavelengths of light to pass through.
