Kidneys are two bean-shaped structures located in the back of the abdomen. Each kidney is about 10 - 13 centimeters (cm), which is four to five inches long. All the blood in the human body passes through the kidney several times a day. The kidneys clean and filter the blood. The waste that is removed from the blood is converted into urine.

The ureter is a tube that carries urine from the kidneys to the bladder. Each ureter is about 25 - 30 centimeters (cm), which is ten to twelve inches long.

The urinary bladder is an elastic sac- like organ that stores the body’s urine.

The urethra is the tube that carries the urine from the urinary bladder to outside the body.