vascular

adj

Etymology: From New Latin vasculāris, from Latin vasculum, diminutive of vas (“vessel”).

1. Relating to the flow of fluids, such as blood, lymph, or sap, through the body of an animal or plant, or to the vessels that carry such fluids

   “Reindeer are well suited to the taiga’s frigid winters. They can maintain a thermogradient between body core and the environment of up to 100 degrees, in part because of insulation provided by their fur, and in part because of counter-current vascular heat exchange systems in their legs and nasal passages.”