human kidneys model on white, close up. the concept of health care, human organ transplant, kidney transplantat

anatomical anatomy artery background biological biology blood body care clinical close column concept dialysis disease education genitourinary gland health healthcare healthy homeostasis human inside internal isolated kidney kidneys medic medical medicine model object organ physiology protection renal science stone system torso transplant transplantat transplantation ureter urinary urine urogenital urologist urology vein white