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| [[Image:Vein med.jpg|right|369x265px|Vein med.jpg]] | | See [[Vein|Vein]] |
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| Veins are blood vessels which carry [[Deoxygenated blood|deoxygenated blood]] from body tissues back to the [[Heart|heart]] and [[Lungs|lungs]]. In the lungs, the deoxygenated blood is reoxygenated through [[Gaseous exchange|gaseous exchange]] in the [[Alveoli|alveoli]].
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| === The structure of Veins ===
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| Veins are made of thin walls of [[Smooth muscle|smooth muscle]], and [[Endothelial tissue|endothelial tissue]]<ref>https://www.mananatomy.com/basic-anatomy/veins 28/10/2017</ref>. They also contain valves, which assist in moving blood at low pressure against the force of gravity back to the heart, in order to be recirculated through the lungs<ref>https://www.mananatomy.com/basic-anatomy/veins, 28/10/2017</ref>.
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| === References ===
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| <references />
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Latest revision as of 09:24, 6 December 2017