Human RNA - Vein
By definition, a vein is a blood vessel that transports blood from the periphery (organs or tissues) to the heart. Veins are therefore different from arteries, which carry blood from the heart to the organs. There are different veins depending on their origin, for example, the pulmonary veins are the veins that carry blood from the lungs to the heart. The veins have different calibers, we distinguish the venules which are the thinnest, the veins of medium caliber and the veins of large caliber which are the veins closest to the heart as for example the inferior and superior vena cava. Only the small and medium caliber infra-cardiac veins have a system of valves that dictate the direction of blood flow and prevent backflow. The walls of the veins are elastic. The valves are made of dense connective tissue, topped by endothelial cells.
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