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Autonomic nervous system
The autonomic nervous system (ANS) is the body's internal regulator, controlling automatic functions and ensuring the coordinated interaction of internal organs. This system operates outside conscious awareness, regulating cardiovascular activity, breathing, digestion, and other processes necessary to sustain life. Its two divisions, the sympathetic and parasympathetic nervous systems, maintain a balance between arousal and relaxation and respond to external and internal factors to preserve the body's internal stability.