Out With the Old: Elimination Parts

Elimination Parts – Out With the Old
Kidneys, Ureters, Bladder, Urethra, Rectum, Anus

Now here’s some really interesting ground to cover: Elimination. Getting rid of Waste. Also known as PEE and POO.

  • Kidneys Like two little factories working, working, working, all the time, your kidneys sit above your pelvis. Kidneys work to filter out what your body doesn’t need for nutrition before sending off remaining liquid waste known as urine (pee) to your bladder.
  • Ureters Your ureters are the thick-walled tubes that act as the paths that take urine from your kidneys to your bladder.

Sidebar: How do you pronounce ureter? Well, just like the old song goes, you say poe-TAY- toe, I say poe-TAH- toe. Some people say YOUR-reh-terz; others say your-REE- terz.

  • Bladder Your bladder, a muscular organ, is like a balloon or plastic baggie that expands and holds urine inside until you are ready to pee.
  • Urethra Once you feel the need to pee, you relax. Urine flows from your bladder through the urethra and into a potty (or the bushes if you’re on a long drive with your parents and there’s no bathroom for a hundred miles). The urethra is considered both an inside and outside part because it starts inside, and ends as an opening to the great outdoors.
  • Rectum – Internal Remember your large intestine or colon? Your large intestine moves waste that is solid (poop). Once it hits the end of your large intestine, it enters the rectum until you are ready to go to the bathroom. You can think of the rectum as the entryway of the anus.


  • Anus Your anus (yes, we know it sounds like a planet) is the opening that carries waste from your rectum to your toilet. We know it’s not the most glamorous subject, but you really need to know it!