anatomy of kidneys: hilum, nephron, and renal calyx

anatomy kidneys hilum nephron renal calyx system loop structure visible biology kidney science illustration vector organ body medicine healthy its parts urinary human medical health electrolyte balance filter waste products urine bladder diagram graphic part scientific physiology art technology symbol control blood pressure eliminated elimination formation red cells operation function tract production excretory functions excretion anatomical physical section surgery vein drawing care cartoon transplant design icon volume calcitriol transformation dialysis reabsorption liquid extracellular fluid filtered regulating homeostasis secrete hormones erythropoietin