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The human body is made up of more than 60 different types of cells, each with its own unique function and purpose. These cells work together to keep us alive and functioning properly. From the beating of our hearts to the blinking of our eyes, every single thing that happens in our bodies is a result of these tiny cells working together in perfect harmony. Our skin is made up of epithelial cells, which are the body's first line of defense against infection and disease. They help to keep us safe from harm by producing mucus, sweat, and other bodily fluids. Our muscles are composed of muscle cells that work together to move our bodies, allowing us to walk, run, and engage in all sorts of physical activities. Our brains are made up of neurons, which are the building blocks of thought, emotion, and movement. They help us to learn, remember, and react to the world around us. Our livers filter out toxins and waste products from our blood, keeping us healthy and strong.