What gives our body its shape and allows us to walk upright? What happens to food after we eat it? How do we walk, run, chew, smile and breathe? Answers to all these and innumerable other questions regarding the functions of the various parts of the human body can be found in this book. Each part of our body does specific jobs, but all the parts work together to make the body run smoothly. Here is a complete introduction to the systems that keep our body working.