An interactive online resource about the structure and function of the nervous system including the eye and vision. What is the nervous system and why is it so important? Human beings need to be able to react to the world around them. The nervous system makes this possible. The nervous system is a network of specialised cells which carry electrical impulses very quickly from one place to another. It carries information from one part of your body to another at high speed. The nervous system not only carries information about changes in your surroundings, it also helps to coordinate all the different systems in your body.