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The human body is made up of several systems that work together to keep it functioning properly. The nervous system sends and receives signals throughout the body, allowing us to move, feel sensations, and think. It also controls involuntary actions such as breathing and digestion. The cardiovascular system transports blood throughout the body, supplying oxygen and nutrients to tissues and removing waste products. This is made possible by the heart pumping blood through a network of arteries, veins, and capillaries. The skeletal system provides support and structure for the body, allowing us to stand upright and move around. It also protects internal organs such as the brain and heart. The muscles work in conjunction with the skeleton to enable movement. The digestive system breaks down food into nutrients that can be absorbed by the body. This process involves the mouth, esophagus, stomach, small intestine, and large intestine. The respiratory system brings oxygen into the body and removes carbon dioxide through the process of breathing. Overall, the human body is a complex and fascinating machine that relies on many different systems working together to keep it alive and functioning properly.