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The human body is a complex and intricate machine, comprising of various systems that work together to sustain life. The nervous system, for instance, sends signals to the brain, which interprets them as sensations, emotions, or thoughts. Similarly, the circulatory system transports oxygen and nutrients to cells throughout the body. A person's height, weight, and other physical attributes are all influenced by their genetic makeup. Environmental factors such as diet and exercise can also have a significant impact on overall health.