The brain is the most important organ in the body, but there's so much scientists still don't know about it. Its main connection is to the nervous system, which helps it tell the rest of the body what to do. These complex processes are broken down in an understandable, relatable way for readers in this volume. Aided by detailed graphic organizers, the main content introduces the structures of a nerve cell, how the eyes work, and many other incredible functions of the nervous system. Entertaining sidebars and a section of frequently asked questions connects the curriculum content to readers' lives.