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Today's lesson: Urinary System
The kidneys are what filters your waste fluid. They have things in them called nephrons.
After that, the fluid flows through the ureters, which are like tubes. They are the plumbing that is in between the kidneys and bladder. If they weren't there, then there would be poison in the body.
Once the body gets through the ureters, the fluid ends up in something called a bladder. It is a big sac-like thing that holds it.
When your brain sends the waves to your bladder muscles, there are muscles under the bladder that relax and the pee flows out through the urethra.
Today's lesson is over.
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