channel for channels_from vein http://upload.wikimedia.org/wikipedia/commons/c/c2/Venous_system_en.svg EV:0100031 galen:Vein CALOHA:TS-1108 MESH:D014680 AAO:0010212 TODO - check with MA - vein vs venous blood vessel Wikipedia:Vein Any of the tubular branching vessels that carry blood from the capillaries toward the heart. venae AEO:0000209 venous vessel MIAA:0000037 BTO:0000234 EHDAA2:0003254 UMLS:C0042449 MA:0000067 FMA:50723 venous NCIT:C12814 Part of the circulatory system composed of blood vessels which carry blood from other organs, tissues, and cells to the heart.[AAO] vena ZFA:0000082 MAT:0000037 venous subtree uberon EMAPA:35906 OpenCyc:Mx4rvVjkWpwpEbGdrcN5Y29ycA EFO:0000816 GAID:492 TAO:0000082 UBERON:0001638 XAO:0000115 VHOG:0001743 SCTID:181367001 vascular element The appearance of Chordata and subsequently the vertebrates is accompanied by a rapid structural diversification of this primitive linear heart: looping, unidirectional circulation, an enclosed vasculature, and the conduction system.[well established][VHOG] venous tree organ part blood vessel capillary venous blood vessel venous blood