In this volume, our heroes Geo and Dr. Brain face hostile white blood cells, Phoebe’s powerful heartbeat, and a bruise that threatens to suck them out of the bloodstream and leave them stranded forever! As you follow their fast-paced comic adventure through Phoebe’s blood, heart, and lungs, you’ll learn all about the human circulatory system. Have you ever wondered... –How your heartbeat keeps a steady pace? –Why your blood forms a scab after you get a cut or scrape? –How your body defends itself against bacteria and other intruders? –How children inherit their blood types from their parents? –How your muscles and brain get the oxygen and nutrients they need to survive? –How the body filters out toxins in food before they reach your bloodstream? For ages 8+ Translated by Army Chung