#renal_vein__renalvein__vena_renalis  veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra
  supertype:  #vein__vena  a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood
  part of:  #kidney  either of two bean-shaped excretory organs that filter wastes (especially urea) from the blood and excrete them and water in urine; urine passes out of the kidney through ureters to the bladder
     part of:  #urogenital_system__urogenital_apparatus__urinary_system__urinarysystem__urinary_apparatus__urinaryapparatu__genitourinary_system__genitourinarysystem__genitourinary_apparatus__genitourinaryapparatu__systema_urogenitale__systemaurogenitale__apparatus_urogenitalis  the system that includes all organs involved in reproduction and in the formation and voidance of urine
     part of:  #urinary_tract__urinarytract  the organs and tubes involved in the production and excretion of urine
        part of:  #urogenital_system__urogenital_apparatus__urinary_system__urinarysystem__urinary_apparatus__urinaryapparatu__genitourinary_system__genitourinarysystem__genitourinary_apparatus__genitourinaryapparatu__systema_urogenitale__systemaurogenitale__apparatus_urogenitalis  the system that includes all organs involved in reproduction and in the formation and voidance of urine

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