Nervous System

Function: The function of the nervous system is to send messages from your brain to your body and from your body to your brain. This is why you can feel things.

Organs: 
nerves: Your nerves are what the signals travel on to get to your brain and to get from your brain. When you touch something the signal travels from your nerves to your brain and when your brain wants you to do something the signal travels from your nerves to do it.
brain: Your brain is a very important part of the nervous system. It is what tells your body to do things and the signal travels through the nerves and you do it. When you feel something the signal goes to your brain so that you can feel what you are touching.
spinal cord: Your spine is another important part of the nervous system. The spinal cord is what the nerves connect to and it tells your brain stuff and your brain tells your body stuff. When you break your spine you will most likely get paralyzed so you can move or feel what is paralyzed.

Other systems that the nervous system works with:
          The nervous system work with all of the systems because it tells everything what to do. The nervous system works with the urinary system to tell your brain when to pee. Your nervous system works with the muscular system to know when to move. The nervous system works with the skeletal system because some of your nerves are in or are part of your bones like how the spine has a very important nerve in it. The nervous system works with the respiratory system to allow you to breathe. The nervous system works with the immune system to tell it when you are sick. The nervous system works with the circulatory system to tell your heart to beat. The nervous system works with the digestive system to tell your brain when to start digesting and when you eat food.

Analogy:

https://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Aiga_mail.svg/2000px-Aiga_mail.svg.png

The nervous system is like mail because:

• They both deliverer a message from one place to another
• They both tell whatever is on the other end something
• They both have have something this signal or the mail travels on like how the mail has roads and the nervous system has nerves.

The nervous system is like mail because they both have the goal of getting something from one place to another. They both tell something to something else. They both make it so that whatever is traveling or being deliver travels on something like how the mail has a road and how the nervous system has nerves.

Structure and Function: 

The main function of the brain is to tell your body everything it needs to do in order for you you to live. It also tells your body to move when you want it to move so that you can walk and you can move your arms. Your brain is made just for this.

1. The brain is as big as it is because if it was any smaller we may not be able to remember as much. We also would not be as smart as we are because if we did not have as much memory or as much storage then we couldn't remember things.

2. Your brain is in your head because it has lots of protection in the head because of the skull. The brain is also connected with your most important nerve which is your spine. your brain also need to be close to important parts of your body like your eyes, ears, mouth etc. because those signals need to get to your brain quick so you can react.

3. Your brain is shaped like it is because the different parts of your brain need to be able to fit together like how the brain stem has to connect to your spine and your cerebrum. Your corpus callosum need to be able to fit to connect the two halves of your brain. Your cerebellum needs to fit in the back of your brain.

Sources:

http://kidshealth.org/en/kids/nsmovie.html

https://www.brainpop.com/health/bodysystems/nervoussystem/