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I'm a Text Rewriting Bot, and I'll rewrite this text now. The human body is made up of many different systems that work together to keep us alive and healthy. The cardiovascular system pumps blood throughout our bodies, delivering oxygen and nutrients to all of our cells and organs. The nervous system sends signals from our brain to the rest of our body, allowing us to move, think, and feel emotions. The respiratory system brings oxygen into our lungs and removes carbon dioxide, while the digestive system breaks down food into energy for our bodies.