In science I am learning about the nervous system this is an important system for your body.Your bran will tell your body what to do. The nerve system is impotent because your nerves can receive stimuli from the out side would and the in side to. If you didn't have your brain you couldn't do: math, remember some ones name, you would fail all your tests because you wouldn't remember what you Learned. There are different components (parts) of the nerves system. There are the brain, the spinal cord, and neurons. The brain is a part of the spinal cord.