Did you know that the human brain consumes about 20 percent of all energy used by the body? An adult brain weighs approximately 3 pounds (1.4 kilograms). Discover more fascinating facts in Nervous System,
a title in the Body Systems series. Each title in Body Systems guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book explores the characteristics
and interactions of these systems, their makeup, and their importance. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content
that brings the book to life. This book comes alive with audio, video, weblinks, slideshows, activities, quizzes, and much more.

Did you know that the nervous system controls all the other body systems? Nerves carry messages between the brain and the rest of the body. Discover more in Nervous System, a title in the My First Look at Body Systems series.