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| Description: Veins are formed from the union of several venules Compared to arteries, veins have a thinner tunica interna and media and a thicker tunica externa Veins have less elastic tissue and less smooth muscle than arteries Veins contain valves Picture Stats: Views: 164 Filesize: 594.69kB Height: 788 Width: 629 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40262 |