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The human body is made up of many complex systems that work together to keep it functioning properly. The circulatory system, also known as the cardiovascular system, is responsible for transporting blood throughout the body. It is made up of the heart, arteries, veins, and capillaries, which all work together to pump blood and deliver oxygen and nutrients to every part of the body. The nervous system is another important system that helps control various bodily functions. It consists of the brain, spinal cord, and nerves, which transmit signals back and forth between different parts of the body. The nervous system plays a crucial role in controlling movement, sensation, and perception, among other things. The digestive system is responsible for breaking down food into nutrients that can be absorbed by the body. It includes organs such as the mouth, esophagus, stomach, small intestine, and large intestine, which all work together to digest food and absorb its nutrients. The immune system helps protect the body from disease-causing microorganisms like bacteria and viruses. It consists of cells, tissues, and organs that work together to defend the body against infection and disease. Overall, the human body is a complex machine that relies on many different systems working together to keep it functioning properly. Each system plays an important role in maintaining overall health and well-being.