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The human body is made up of approximately 60 trillion cells. These cells are the building blocks of life and perform a wide range of functions that keep us alive. The heart pumps blood through the veins, arteries, and capillaries to supply oxygen and nutrients to every cell in our body. The lungs take in oxygen and expel carbon dioxide through the process of breathing. The brain controls everything we do, think, and feel by sending signals to the rest of our body through a complex network of neurons.