"The muscular system gives humans their shape and helps them move their body. Without muscles, people would look very different-and they wouldn't be able to move! This inside guide to our muscles uses relatable examples, discussion questions, sidebars, and fact boxes to dive in to what makes the muscular system work. Age-appropriate language is used in conjunction with detailed photographs and diagrams to explain key concepts such as main muscles...

"The human respiratory system is what makes people able to breathe. Without it, people wouldn't live for very long! This detailed guide to a basic part of human biology explains what the respiratory system is, how it works, and the key organs used in the process. Fun fact boxes, vivid photographs and diagrams, and accessible language paint a detailed picture of the respiratory system and highlight its importance for human life. Readers are also asked...

"The nervous system is the messenger system of the human body. Without it, you couldn't move your muscles, type on a computer, or think! This title offers a comprehensive breakdown of the nervous system, highlighting key aspects connected to it, such as nerves, signals, and reflexes. Through easy-to-understand language, fun fact boxes, intriguing sidebars, and colorful photographs and diagrams, readers are able to fully comprehend this vast and complex...