関連ワード:  function of urethra and bladder    function of ureter and bladder    function of urethra and urinary bladder    function of urethra bladder in excretory system    function of urethra bladder class 10    function of ureter bladder and urethra    function of ureter bladder and urethra ppt    function of ureter and urinary bladder    function of kidney ureter bladder    function of ureter urethra and urinary bladder