Tetra-1

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The human body is a complex machine that operates on a multitude of levels. It is comprised of various systems, each working in harmony to maintain overall health and function. The skeletal system provides structural support, while the muscular system enables movement and flexibility. Meanwhile, the nervous system transmits signals, allowing for communication between different parts of the body. Additionally, the circulatory system pumps blood throughout the body, supplying vital organs with oxygen and nutrients.