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The human body is a complex and intricate system that consists of numerous systems and organs working together to maintain overall health and well-being. The nervous system, which includes the brain, spinal cord, and nerves, plays a crucial role in controlling various bodily functions such as movement, sensation, perception, and cognition. The circulatory system, comprising the heart, blood vessels, and blood, is responsible for transporting oxygen and nutrients to cells throughout the body while removing waste products. The respiratory system, consisting of the lungs, trachea, bronchi, and diaphragm, works to facilitate gas exchange between the atmosphere and the bloodstream.