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The human body is a remarkable machine that functions seamlessly, often without us even realizing it. Our hearts beat steadily, pumping blood throughout our veins and arteries, delivering oxygen and nutrients to every cell in our bodies. Our lungs expand and contract with each breath, taking in oxygen and expelling carbon dioxide. Our brains are constantly active, processing information, controlling movement, and regulating countless bodily functions. Our skin protects us from the outside world, shielding us from harm and maintaining a stable internal environment. Our muscles move us through space, allowing us to walk, run, jump, and perform an endless array of physical activities.