Rephrasing for a 6-year-old: 6 simple ways to say how blood is like a river (age 6)

Here are 6 simple ways to say it, using words a 6-year-old will understand:

1. Blood is like a river that brings air and food to every part of your body and takes away their trash.
2. Your blood flows like a little river, giving each cell oxygen (like fresh air) and tiny food bits, then carrying away the yucky stuff.
3. Think of blood as a busy river: it drops off air and food to your cells and picks up the stuff they don't need.
4. Blood works like a river that gives cells fresh air and food and washes away the used-up bits.
5. Like a river, blood moves around your body to deliver oxygen and nutrients and to carry away the waste.
6. A river of blood travels through you, bringing cells what they need and taking away what they don't.

Tip: Point to your body and say one of these to help explain.