Relating to or contained in veins, the blood vessels that carry blood back to the heart. Describes the deoxygenated blood circulation system.
From Latin venosus meaning 'full of veins', from vena 'vein'. The medical terminology developed as anatomical understanding advanced in the Renaissance period.
Venous blood appears blue through your skin not because it's actually blue, but because of how light wavelengths interact with skin and hemoglobin. The blood itself is always red, just darker when deoxygenated!
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