Ghost

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The human body is a complex and intricate system that functions on a multitude of levels, all working together to maintain life and health. It is made up of trillions of cells, which are the basic building blocks of life, and these cells work in harmony with one another to create the various systems that make up the human machine. The nervous system sends messages through the brain, while the circulatory system delivers oxygen and nutrients throughout the body. The digestive system breaks down food into its component parts, using enzymes and acids to extract vital nutrients.