we usually distinguish veins from arteries [ by external appearance] by the bluish lines on the skin ,WHAT is responsible for this bluish/greenish pigmentation.
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A bluish color to the skin or mucous membrane is usually due to a lack of oxygen in the blood. The medical term is cyanosis.
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blue skin was caused by a rare genetic disease called methemoglobinemia. Methemoglobinemia is a blood disorder in which an abnormally high amount of methemoglobin — a form of hemoglobin — is produced. ... In methemoglobinemia, the hemoglobin is unable to release oxygen effectively to body tissues
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