existence ends during fully formed stage anatomical system circulatory system AAO:0000959 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] CALOHA:TS-2103 FBbt:00005057 OpenCyc:Mx4rvVjzG5wpEbGdrcN5Y29ycA UBERON:0001009 VHOG:0001248 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] 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]. systema cardiovasculare the cardiovascular system and the lymphatic system are parts of the circulatory system uberon