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The human body is a complex system that relies heavily on its nervous and circulatory systems to function properly. The nervous system, which includes the brain, spinal cord, and nerves, plays a crucial role in controlling the body's movements, sensations, and functions. It sends and receives signals to and from different parts of the body, allowing for communication between various organs and tissues. The circulatory system, on the other hand, is responsible for transporting oxygen and nutrients throughout the body while removing waste products. This is achieved through a network of blood vessels that branch out into smaller capillaries, where oxygen and nutrients are exchanged for carbon dioxide and other waste substances. The heart pumps blood through this network, ensuring that all parts of the body receive the necessary supplies to function optimally. In addition to these two systems, the human body also relies on its immune system to protect against diseases and infections. This system consists of various cells and organs that work together to identify and eliminate foreign substances, such as bacteria, viruses, and other pathogens, from the body. The digestive system is responsible for breaking down food into nutrients that can be absorbed by the body. It includes the mouth, esophagus, stomach, small intestine, and large intestine, each playing a vital role in the digestion process. The skin also plays a crucial role as the body's largest organ, protecting against external damage and regulating body temperature. Lastly, the human body is composed of 206 bones that provide structural support, protection for internal organs, and facilitate movement through joints.