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vein
A blood vessel that carries blood low in oxygen content from the body back to the heart.

The deoxygenated form of hemoglobin (deoxyhemoglobin) in venous blood makes it appear dark and the veins are part of the afferent wing of the circulatory system which returns blood to the heart.

vein
Conceited
This entry is located in the following unit: Medical Terms from a Different Perspective (page 3)