only_in_taxon only in taxon capable of capable_of capable of existence ends during circulatory system process Bilateria Cnidaria Platyhelminthes Nematoda Homo sapiens Homo sapiens fully formed stage anatomical system circulatory system FBbt:00005057 OpenCyc:Mx4rvVjzG5wpEbGdrcN5Y29ycA http://upload.wikimedia.org/wikipedia/commons/2/29/Circulatory_System_en.svg Anatomical system of ion binding, a pumping mechanism, and an efficient vascular system; consisting of the blood, heart, and blood and lymph vessels, respectively.[AAO] Organ system that passes nutrients (such as amino acids and electrolytes), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis[WP]. uberon AAO:0000959 systema cardiovasculare the cardiovascular system and the lymphatic system are parts of the circulatory system MESH:D002319 organ system that passes nutrients (such as amino acids and electrolytes), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis[WP]. VHOG:0001248 Wikipedia:Circulatory_system CALOHA:TS-2103 UBERON:0001009 We should divest ourselves of the view that earlier vertebrate groups were 'on their way' to becoming mammals, as clearly they were not such visionaries. Neither were their systems 'imperfect' as earlier anatomists thought. Instead, their circulatory systems served them well to address the ecological demands arising from their lifestyles.[well established][VHOG]