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The human body is a complex and dynamic system that is capable of adapting to a wide range of environments and situations. The human brain, which is responsible for controlling the body's functions, is a highly specialized organ that is made up of billions of cells called neurons. These neurons communicate with each other through electrical and chemical signals, allowing the brain to process information and control the body's movements. The human nervous system, which includes the brain, spinal cord, and nerves, plays a crucial role in controlling the body's functions, including movement, sensation, and cognitive function.