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.
Veins are part of the afferent wing of the circulatory system which
returns blood to the heart.
By contrast, an artery is a vessel that carries blood high in
oxygen away from the heart to the body. The oxygenated form of
hemoglobin (oxyhemoglobin) in arterial blood makes it look bright
red. Arteries are part of the efferent wing of the circulatory system
which carries blood away from the heart.
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