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The human body is a highly complex system that is capable of incredible feats. It is made up of trillions of cells, each one working together to keep you alive and functioning properly. From the tips of your toes to the top of your head, every part of your body plays an important role in keeping you healthy and active. Your heart pumps blood throughout your entire body, providing oxygen and nutrients to all of your organs and tissues. Your lungs breathe in oxygen and expel carbon dioxide, allowing you to take in fresh air and get rid of waste products. Your brain thinks and learns new things, controlling everything from your movements to your thoughts and emotions. Your muscles allow you to move and perform physical tasks, while your skeleton provides support and protection for all of your organs and tissues. Your skin protects you from the outside world, keeping you safe from harm and regulating your body temperature.