Open your 'human body construction guide' to reveal the answers to all your puzzling human biology questions! Find out what each body system does and how they fit together to create a living, breathing person. Styled as a construction guide, readers will explore the ten major body systems from the inside out - from your bones to your nerves! Each spread contains body part checklists and 'Don't forget' notes for key information. The human engineer slant imparts STEM concepts for budding biologists and doctors. Prepare to get under the skin of the human body machine and find out what makes it tick.