Stomach acid can dissolve metal, saliva contains a painkiller, and our blood vessels, when lined up, could wrap around the Earth once. The body is a marvel and functions only through teamwork from head to toe. But how do the trillions of cells work together? To find out, readers embark on a breathtaking journey into our innermost being. They dive into the eye with a beam of light and swim with blood cells through vessels. Along the way, they learn how cells are structured, the roles of red and white blood cells, and why a body can sometimes get sick. Only those who know their body can keep it healthy. An exciting non-fiction book with astonishing facts for children aged 8 and up.