The brain is the dominant organ, and is in control of maintaining our internal environment: homeostasis. It responds to changes from stimuli, both internally and externally. Our nervous system transmits responses and is comprised of our Central and Peripheral systems. Within the Peripheral system, there are subdivisions including the parasympathetic, or 'rest and digest' and sympathetic or 'fight and flight' responses. These systems are complementary, so when one is active, the other is suppressed.
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