Chapter 1 THE CENTRAL SYSTEM Your body has many systems A system is a way of doing things Your body’s systems help it do the things it needs to do to stay alive Your body is like a complicated machine What are some of the things happening inside your body 4
Your muscles and bones help you move Your heart pumps blood through your body Your lungs bring in air And your stomach breaks down the food you eat But what keeps all these systems working Your body’s systems help you do things such as playing games 5
Command Center Your nervous system controls all the other systems It keeps track of everything that happens in your body Your nervous system tells your other systems what to do Without your nervous system none of your other systems could do their jobs Your nervous system keeps all your other systems working It also helps you to think 6
But your nervous system does much more than just control your other systems Your nervous system helps you dance It helps you solve puzzles It helps you laugh It helps you remember the names of your friends It helps you see flowers and hear music It even helps you dream YOUR NERVOUS SYSTEM TELLS YOUR MUSCLES HOW TO MOVE 7
