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The human body is made up of numerous systems that work together to keep us alive and functioning properly. The nervous system, which includes the brain and spinal cord, controls all of our voluntary movements such as walking, talking, and writing. It also allows us to feel sensations like pain and touch. The circulatory system, on the other hand, is responsible for delivering oxygen and nutrients to every cell in our body. This system consists of the heart, arteries, veins, and blood vessels that transport these vital elements throughout our body. In addition to these two major systems, we also have a digestive system that breaks down food into nutrients that can be used by our body. The respiratory system brings oxygen into our lungs where it is then distributed to the rest of our body. These are just some examples of the many systems that make up the human body and how they work together to keep us alive.