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The human body is a complex and dynamic system that functions as a whole unit to maintain homeostasis and ensure overall health. The human brain plays a central role in controlling various bodily processes, including movement, sensation, perception, and cognition. In addition, the heart pumps blood throughout the circulatory system, supplying oxygen and nutrients to cells and organs while removing waste products. The respiratory system brings oxygen into the body through inhalation, while the digestive system breaks down food into nutrients that are absorbed and utilized by the body. The immune system protects against pathogens and disease-causing agents, and the nervous system transmits signals between cells and organs to coordinate bodily functions.