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The human body is a complex system that consists of many different parts all working together to keep the person alive and functioning properly. The brain, which is the control center of the body, sends out signals to other parts of the body through a network of nerves. These signals can be either voluntary or involuntary, depending on whether they are under conscious control or not. Voluntary movements are those that are under conscious control, such as moving an arm or leg. Involuntary movements, on the other hand, occur without the person being aware of them, such as blinking or digesting food. The muscles in the body work together to move the skeleton, which provides support and protection for the organs. The heart pumps blood throughout the body, supplying oxygen and nutrients to all of its cells. It also removes waste products from the body by pumping them out into the bloodstream. The circulatory system is made up of the heart and blood vessels, including arteries, veins, and capillaries.