There are over 1 million nephrons in each kidney. Nephrons are the tiny filtering units in the kidneys - they filter out waste products as well as minerals and water the body needs expel. The liquid waste is called urine. Urine flows through the ureters; two narrow tubes that connect the kidneys to the bladder. Urine is stored in the bladder. When we urinate (pee) urine travels down another tube, called the urethra, and out of the body.
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