Most people have two kidneys. They sit at the back of the body, one on each side, just underneath the ribcage. They filter the blood to remove waste products, which they convert into urine. Urine is carried from each kidney, through a tube called a ureter to the bladder, where it is stored.
When you are ready to pass urine, it leaves the bladder through a tube called the urethra. The urethra opens immediately in front of the vagina in women and at the tip of the penis in men.
Via: http://www.cancerbackup.org.uk
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