Organs are parts of the body that have a special . They are made up of tiny cells. The is the control panel for the whole body. It tells our limbs to move, it controls our senses and our thoughts. Our lungs take in from the air when we breathe in and get rid of carbon dioxide when we breathe out. The oxygen passes from the lungs into the blood and is pumped all around the body by the . Our food is dealt with by the system. When we eat, the food passes into the stomach where special chemicals called begin to digest it. It then passes then into a tube called the , which is about eight metres long in an adult. There, food is broken down further and the pass through the walls of the intestine into the blood stream. The blood also carries waste products to the lungs and the kidneys so that the body can get rid of them. Carbon dioxide is taken to the lungs to be breathed out, and waste chemicals are taken to the , which turn them into a liquid called .