Food that your body cannot use becomes poop. Waste and extra water become pee. The trip starts in your mouth, where spit makes food easy to swallow.

Your liver makes bile, a juice that helps break down fats. Bile also gives poop its brown color.

The large intestine takes water out of what is left of your food. This turns it into poop.

Pee has its own route. Your kidneys clean your blood and take out waste and extra water. It is made of water, salts and waste.

Your bladder is like a balloon that gets bigger as it fills with pee. When it is full, it sends a message to your brain.

To pee, the wall of the bladder squeezes and pushes it out of the body. Your body does this on its own, but you get to choose when to go.

Pale yellow pee often means you have plenty of water in your body. Dark yellow means there is less water in it, and you may need a drink. If anything ever hurts, tell a grown-up.

Wombats are the only animals known to make poop shaped like cubes. That is true as of November 2026.

Words to know

• bile: liver juice
• bladder: pee bag
• kidneys: blood cleaners