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The human body is made up of many different organs and systems that work together to keep us alive and healthy. The heart pumps blood throughout the body, supplying oxygen and nutrients to our cells. The lungs breathe in oxygen and exhale carbon dioxide, while the brain controls our movements, thoughts, and emotions. Our digestive system breaks down the food we eat into nutrients that can be absorbed by the body. The immune system protects us from germs and other foreign substances that might harm us.