Your´re fast asleep, and nothing is happening. Or is it? In fact, your body is hard at work. Your lungs are taking oxygen from the air, and your heart is pumping blood round your body. Millions of pieces of information are travelling backwards and forwards to your brain all the time. Muscles are preparing themselves, and in your limph nodes special cells are cleaning germs and waste from the body. Upravené čítanie z edície Oxford Bookworms Library Factfiles, úroveň 3 (B1, 1000 kľúčových slov). anglický text