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How do the kidneys work in teens?

Dr. Michael Roizen, MD
Internal Medicine
Kidneys are made of little units called nephrons. Each nephron functions separately as a minifiltration plant, filtering bad stuff or unneeded stuff from the blood. Drugs such as marijuana, cocaine, steroids, and narcotics (the frequently abused painkiller oxycodone, for instance, better known by its brand name, OxyContin) get filtered out here, which is why they’re detectible in a urine test. Water and good stuff like most amino acids and glucose get reabsorbed, and the bad stuff moves from the nephron into one of two collecting tubes called the ureters. You have one ureter attached to each kidney, and they both dump into the bladder, the storage tank for urine.    
YOU: The Owner's Manual for Teens: A Guide to a Healthy Body and Happy Life

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YOU: The Owner's Manual for Teens: A Guide to a Healthy Body and Happy Life

A few years ago, we wrote YOU: The Owner’s Manual, which taught people about the inner workings of their bodies—and how to keep them running strong. But you know what? There’s a big difference...

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