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This page is being repeatedly vandalized by an anon editor. 76.180.144.36 ( talk) 17:18, 11 June 2011 (UTC) reply

I think that the diagram has an error. The entire space within the vein between the valves on the right hand side should be coloured red to indicate that it is filled with blood. It makes no sense to suggest that there should be a space above the lower valve. Strayan ( talk) 03:38, 5 November 2019 (UTC) reply