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The human body is a complex system of organs and tissues that work together to maintain life. It consists of over 60 trillion cells, which are organized into different systems such as the nervous, circulatory, and digestive systems. Each system plays a vital role in maintaining the body's overall function and health. The skin, the largest organ of the body, protects it from external damage and helps regulate body temperature. The skeletal system provides support and structure for the body, while the muscular system enables movement and locomotion. The circulatory system transports oxygen and nutrients to cells throughout the body, and the nervous system transmits signals between different parts of the body. The human brain is a highly specialized organ that controls thought, emotion, and behavior. It processes information from sensory receptors and sends out signals to muscles and glands to produce movement and other bodily functions. The heart pumps blood throughout the body, supplying oxygen and nutrients to cells and removing waste products.