The autonomic nervous system is divided into the sympathetic and parasympathetic divisions. The sympathetic division increases energy use, often referred to as the "fight or flight" response, preparing the body for action by increasing heart rate and redirecting blood flow. Conversely, the parasympathetic division conserves energy and promotes "rest and digest" activities, slowing the heart rate and enhancing digestion. Together, these divisions maintain the body's homeostasis by balancing energy expenditure and conservation.
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