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The human body is a complex system of organs and tissues that work together to sustain life. It consists of the skeletal system, which provides support and protection for internal organs; the muscular system, which enables movement and maintains posture; the nervous system, which transmits signals between different parts of the body; the circulatory system, which transports oxygen and nutrients to cells and removes waste products; the digestive system, which breaks down food into nutrients that can be absorbed by the body; and the endocrine system, which produces hormones that regulate various bodily functions. The skin is the largest organ in the human body, serving as a barrier against external factors such as temperature, humidity, and infection. It also plays a crucial role in regulating body temperature through sweating.