Your amazing human body comes complete with a full set of systems that work together to make you. How Your Body Works introduces the marvels of the human body and unlocks some basic mysteries, such as why blood is red, why you couldn't hear without tiny hairs, why parts of your bones look like sponge, why your brain is even better than the fastest computer, why your lungs could cover a tennis court, and why your small intestine is actually as long as a bus. A clear, straightforward style captures and holds the interest of young readers to instill a lifetime of wonder. Inside your body, a marvelous river of life keeps you alive and healthy. Travel along as your amazing blood moves through your heart and the rest of your circulatory system. Discover the secrets of this sticky liquid that can change color, mend your wounds, and nourish your tissues.