Your brain also controls your nervous system, sending messages along the nerves that act as highways around your body that carry the message from your brain to all of its major organs. Your brain tells your muscles when to contract and relax; it tells your body when to stand or sit. As well as these kinds of actions, it also regulates how well your major organs work. For example, it will tell your heart to beat faster if you need a surge of energy to walk faster or run.
Infographic by: ncchomelearning.co.uk