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The human body is made up of billions of tiny cells that work together to keep us alive and healthy. These cells are the building blocks of life, and they're what make our bodies function properly. The heart pumps blood throughout the body, supplying oxygen and nutrients to all our organs and tissues. The brain controls everything we do, from thinking and learning to moving and feeling emotions. Our lungs breathe in oxygen and expel carbon dioxide, while our digestive system breaks down food into energy for our cells. Every single one of these systems works together to keep us alive, and if any part of them fails, it can have serious consequences for our health.