What is an alveolus? Why does blood look red? How can we keep our lungs healthy? The Human Machine asks the questions that young people want answered. Each chapter contains a different question, so readers can develop their knowledge.

Digestion and Excretion

by Louise Spilsbury

Published 15 April 2008
What are villi? How do bacteria help the digestive system? Why is fibre important? The Human Machine asks the questions that young people want answered. Each chapter contains a different question, so readers can develop their knowledge.

The Skeleton and Muscles

by Louise Spilsbury

Published 15 April 2008
What is cartilage? Why do we have joints? How does exercise help bones and muscles? The Human Machine asks the questions that young people want answered. Each chapter contains a different question, so readers can develop their knowledge.