What are heart and muscles?

A heart is like a little pump that keeps your blood moving around your body, and muscles are like stretchy bands that help you move your arms, legs, and even smile.

Imagine you have a water bottle with a straw. When you suck on the straw, water goes up into the bottle. Your heart is kind of like that, it pumps blood through your body using a special rhythm. It beats all day long, and sometimes you can feel it beating in your chest.

Now think about when you squeeze a sponge to get water out. That's what muscles do! They stretch and shrink to help you move, like when you walk, jump, or even frown. Some muscles are big, like the ones in your legs, and some are tiny, like the ones that help you blink.

Your heart and muscles work together all day long so you can play, run, laugh, and explore!