Explains how the muscular system works, and discusses its role in the human body, problems that can affect the muscular system, and how to keep muscles healthy.
Provides information about erosion, discussing what it is, and explaining how it happens; and looks at the effects of erosion on the land. Includes an activity, glossary, and a list of books for further research.
Explains how the circulatory system works, and discusses its role in the human body, problems that can affect the circulatory system, and how to stay healthy.
Explains how the respiratory system works, and discusses its role in the human body, problems that can affect the respiratory system, and how to keep lungs healthy.
Looks at the role of glands and hormones in the human body, explains how the endocrine and circulatory systems work together, and discusses some of the things that can go wrong with the endocrine system.
Explains how the digestive system works, and discusses its role in the human body, problems that can affect the digestive system, and how to develop healthy habits.