The human body library

Examines the digestive and excretory systems of the body and describes how food is broken down into molecules of nutrients that provide energy for the body and how the excretory system filters the blood and regulates the amount of salt and water in the body.

Examines the role of the nervous system in the human body; discusses the relationship among the components of the nervous system including the brain, spinal cord, and the nerves; explains how the nervous system works; and looks at some of the disorders and diseases of the system.