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The human body is a complex and highly organized system that consists of multiple organs and tissues that work together to maintain overall health and function. The brain, which is protected by the skull, acts as the control center for the entire body, sending and receiving signals through the nervous system. The nervous system includes the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS consists of nerves that branch out from the brain and spinal cord to the rest of the body. These nerves transmit signals between different parts of the body, allowing for communication and coordination between organs and tissues. The skeletal system provides support and structure for the body, while the muscular system allows for movement and flexibility. The circulatory system transports oxygen and nutrients throughout the body, while the respiratory system brings in oxygen and removes carbon dioxide through breathing.