Urinary System Lesson for Kids: Definition & Facts

Instructor: Lindsy Frazer

Dr. Frazer has taught several college level Science courses and has a master's degree in Human Biology and a PhD in Library and Information Science.

Did you know that peeing is actually your body's way of taking out the trash? Learn about the urinary system, how it keeps you healthy and more amazing facts about pee in this lesson.

The Urinary System

What happens after you drink a lot of water? You have to go - to the bathroom that is!


Even though drinking a lot makes us run to the bathroom, pee, also called urine, is much more than just the water and other stuff we drink. Urine is your body's way of taking out the trash!

Your body has a network of organs, called the urinary system, that work together to make and get rid of urine.

Parts of the Urinary System

We go to the bathroom several times a day without even thinking about the long journey our urine has to make. There are four main parts of the urinary system: kidneys, ureters, bladder and urethra. Let's look at each in more detail.

The urinary system is made up of the kidneys, ureters, bladder and urethra. These parts work together to make and get rid of urine.


What did one bean say to the other? 'How you bean?' You have two bean-shaped organs in your body called kidneys (but I doubt they talk to each other!). The main job of the kidneys is to remove waste and extra water from your blood. This waste comes from the normal functions your body performs every day, like digesting food.

The kidneys combine this waste and water to make urine. So, peeing is an important way our bodies get rid of waste and keep us healthy.


Once urine is made by the kidneys, it starts its journey out of your body. The ureters are two long, muscular tubes that transport the newly made urine from your kidneys to your bladder.


Imagine filling up a water balloon. The balloon starts out kind of flat and expands as you add water. Your bladder works the same way. When it's empty, it's like the deflated balloon, but as it fills with urine, it expands. Just like water balloons store water until you're ready to soak your friend, the bladder stores urine until it's time to pee. When it's full, nerves in the bladder send a message to your brain that says, 'It's time to go!'

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