Nervous System: A Book Filled With Facts For Children (Paperback)
The nervous system is made up of numerous nerve cells, which receive and interpret information from your body's senses. These sensory cues are translated into instructions that your brain sends to all parts of your body. In fact, every person has billions of nerve cells, including 100 billion in the brain and 13.5 million in the spinal cord. Neurons are composed of electrochemical energy, which is carried to the brain through the nervous system.