関連ワード:  function of ureter in urinary system    function of ureter in renal system    main function of ureter in urinary system    function of ureter in human urinary system    function of right ureter in urinary system    function of left ureter in urinary system    function of ureter urinary bladder and urethra    function of ureter and urinary bladder    what are the normal functions of the urinary system    what is urinary system and its function