structure of kidneys. anatomy of kidneys. main organ of the urinary system. kidneys excrete metabolic waste from the body b

anatomical anatomy artery biology blood body capsule care cross diagram disease editable education excrete excretory external health healthy human illustration internal kidney kidneys main medical medicine medulla metabolic micturition nephron nephrotic organ part pelvis physiology producing renal science scientific section structure study system ureter urinary urine urology vector vein waste